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[
"Paper",
"made from material",
"wood fiber"
] |
Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying. Although paper was originally made in single sheets by hand, almost all is now made on large machines—some making reels 10 metres wide, running at 2,000 metres per minute and up to 600,000 tonnes a year. It is a versatile material with many uses, including printing, painting, graphics, signage, design, packaging, decorating, writing, and cleaning. It may also be used as filter paper, wallpaper, book endpaper, conservation paper, laminated worktops, toilet tissue, or currency and security paper, or in a number of industrial and construction processes.
The papermaking process developed in east Asia, probably China, at least as early as 105 CE, by the Han court eunuch Cai Lun, although the earliest archaeological fragments of paper derive from the 2nd century BCE in China. The modern pulp and paper industry is global, with China leading its production and the United States following.
| 17
|
[
"Paper",
"instance of",
"physical object"
] |
Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying. Although paper was originally made in single sheets by hand, almost all is now made on large machines—some making reels 10 metres wide, running at 2,000 metres per minute and up to 600,000 tonnes a year. It is a versatile material with many uses, including printing, painting, graphics, signage, design, packaging, decorating, writing, and cleaning. It may also be used as filter paper, wallpaper, book endpaper, conservation paper, laminated worktops, toilet tissue, or currency and security paper, or in a number of industrial and construction processes.
The papermaking process developed in east Asia, probably China, at least as early as 105 CE, by the Han court eunuch Cai Lun, although the earliest archaeological fragments of paper derive from the 2nd century BCE in China. The modern pulp and paper industry is global, with China leading its production and the United States following.
| 22
|
[
"Paper",
"different from",
"parchment"
] |
Etymology
The word paper is etymologically derived from Latin papyrus, which comes from the Greek πᾰ́πῡρος (pápūros), the word for the Cyperus papyrus plant. Papyrus is a thick, paper-like material produced from the pith of the Cyperus papyrus plant, which was used in ancient Egypt and other Mediterranean cultures for writing before the introduction of paper. Although the word paper is etymologically derived from papyrus, the two are produced very differently and the development of the first is distinct from the development of the second. Papyrus is a lamination of natural plant fibre, while paper is manufactured from fibres whose properties have been changed by maceration.
| 27
|
[
"NGC 884",
"instance of",
"open cluster"
] |
NGC 884 (also known as χ Persei) is an open cluster located 7640 light years away in the constellation of Perseus. It is the easternmost of the Double Cluster with NGC 869. NGC 869 and 884 are often designated h and χ Persei, respectively. The cluster is about 14 million years old. Located in the Perseus OB1 association, both clusters are located physically close to one another, only a few hundred light years apart. The clusters were first recorded by Hipparchus, thus have been known since antiquity.
The Double Cluster is a favorite of amateur astronomers. These bright clusters are often photographed or observed with small telescopes. Easy to find, the clusters are visible with the unaided eye between the constellations of Perseus and Cassiopeia as a brighter patch in the winter Milky Way. The Double Cluster was also included in the Caldwell catalogue, a catalogue of astronomical objects for amateur observation.In small telescopes, the cluster appears as a beautiful assemblage of bright stars located in a rich star field. Dominated by bright blue stars, the cluster also hosts a few orange stars that add to the visual interest. Both clusters together offer a spectacular low-magnification view.
| 6
|
[
"Double Cluster",
"instance of",
"open cluster"
] |
The Double Cluster (also known as Caldwell 14) consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ (chi) Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of about 7,500 light years in the Perseus Arm of the Milky Way galaxy.
| 1
|
[
"Acupuncture",
"country of origin",
"People's Republic of China"
] |
History
Origins
Acupuncture, along with moxibustion, is one of the oldest practices of traditional Chinese medicine. Most historians believe the practice began in China, though there are some conflicting narratives on when it originated. Academics David Ramey and Paul Buell said the exact date acupuncture was founded depends on the extent to which dating of ancient texts can be trusted and the interpretation of what constitutes acupuncture.Acupressure therapy was prevalent in India. Once Buddhism spread to China, the acupressure therapy was also integrated into common medical practice in China and it came to be known as acupuncture. The major points of Indian acupressure and Chinese acupuncture are similar to each other.According to an article in Rheumatology, the first documentation of an "organized system of diagnosis and treatment" for acupuncture was in Inner Classic of Huang Di (Huangdi Neijing) from about 100 BC. Gold and silver needles found in the tomb of Liu Sheng from around 100 BC are believed to be the earliest archaeological evidence of acupuncture, though it is unclear if that was their purpose. According to Plinio Prioreschi, the earliest known historical record of acupuncture is the Shiji ("Records of the Grand Historian"), written by a historian around 100 BC. It is believed that this text was documenting what was established practice at that time.
| 0
|
[
"Acupuncture",
"part of",
"acupuncture and moxibustion"
] |
Clinical practice
Acupuncture is a form of alternative medicine. It is used most commonly for pain relief, though it is also used to treat a wide range of conditions. Acupuncture is generally only used in combination with other forms of treatment. For example, the American Society of Anesthesiologists states it may be considered in the treatment for nonspecific, noninflammatory low back pain only in conjunction with conventional therapy.Acupuncture is the insertion of thin needles into the skin. According to the Mayo Foundation for Medical Education and Research (Mayo Clinic), a typical session entails lying still while approximately five to twenty needles are inserted; for the majority of cases, the needles will be left in place for ten to twenty minutes. It can be associated with the application of heat, pressure, or laser light. Classically, acupuncture is individualized and based on philosophy and intuition, and not on scientific research. There is also a non-invasive therapy developed in early 20th century Japan using an elaborate set of instruments other than needles for the treatment of children (shōnishin or shōnihari).Clinical practice varies depending on the country. A comparison of the average number of patients treated per hour found significant differences between China (10) and the United States (1.2). Chinese herbs are often used. There is a diverse range of acupuncture approaches, involving different philosophies. Although various different techniques of acupuncture practice have emerged, the method used in traditional Chinese medicine (TCM) seems to be the most widely adopted in the US. Traditional acupuncture involves needle insertion, moxibustion, and cupping therapy, and may be accompanied by other procedures such as feeling the pulse and other parts of the body and examining the tongue. Traditional acupuncture involves the belief that a "life force" (qi) circulates within the body in lines called meridians. The main methods practiced in the UK are TCM and Western medical acupuncture. The term Western medical acupuncture is used to indicate an adaptation of TCM-based acupuncture which focuses less on TCM. The Western medical acupuncture approach involves using acupuncture after a medical diagnosis. Limited research has compared the contrasting acupuncture systems used in various countries for determining different acupuncture points and thus there is no defined standard for acupuncture points.In traditional acupuncture, the acupuncturist decides which points to treat by observing and questioning the patient to make a diagnosis according to the tradition used. In TCM, the four diagnostic methods are: inspection, auscultation and olfaction, inquiring, and palpation. Inspection focuses on the face and particularly on the tongue, including analysis of the tongue size, shape, tension, color and coating, and the absence or presence of teeth marks around the edge. Auscultation and olfaction involve listening for particular sounds such as wheezing, and observing body odor. Inquiring involves focusing on the "seven inquiries": chills and fever; perspiration; appetite, thirst and taste; defecation and urination; pain; sleep; and menses and leukorrhea. Palpation is focusing on feeling the body for tender "A-shi" points and feeling the pulse.
| 12
|
[
"Perseids",
"named after",
"Perseus"
] |
The Perseids are a prolific meteor shower associated with the comet Swift–Tuttle. The meteors are called the Perseids because the point from which they appear to hail (called the radiant) lies in the constellation Perseus.Etymology
The name is derived from the word Perseidai (Greek: Περσείδαι), the sons of Perseus in Greek mythology.
| 1
|
[
"Aeolipile",
"named after",
"Hero of Alexandria"
] |
An aeolipile, aeolipyle, or eolipile, from the Greek "αιολουπυλη", also known as a Heron's engine, is a simple, bladeless radial steam turbine which spins when the central water container is heated. Torque is produced by steam jets exiting the turbine. The Greek-Egyptian mathematician and engineer Hero of Alexandria described the device in the 1st century AD, and many sources give him the credit for its invention. However, Vitruvius was the first to describe this appliance in his De architectura (ca. 30–20 BC).The aeolipile is considered to be the first recorded steam engine or reaction steam turbine, but it is neither a practical source of power nor a direct predecessor of the type of steam engine invented during the Industrial Revolution.The name – derived from the Greek word Αἴολος and Latin word pila – translates to "the ball of Aeolus", Aeolus being the Greek god of the air and wind.
| 1
|
[
"Heron's fountain",
"discoverer or inventor",
"Hero of Alexandria"
] |
Heron's fountain is a hydraulic machine invented by the 1st century AD inventor, mathematician, and physicist Heron of Alexandria (also known as Hero of Alexandria).
Heron studied the pressure of air and steam, described the first steam engine, and built toys that would spurt water, one of them known as Heron's fountain. Various versions of Heron's fountain are used today in physics classes as a demonstration of principles of hydraulics and pneumatics.
| 0
|
[
"Heron's fountain",
"named after",
"Hero of Alexandria"
] |
Heron's fountain is a hydraulic machine invented by the 1st century AD inventor, mathematician, and physicist Heron of Alexandria (also known as Hero of Alexandria).
Heron studied the pressure of air and steam, described the first steam engine, and built toys that would spurt water, one of them known as Heron's fountain. Various versions of Heron's fountain are used today in physics classes as a demonstration of principles of hydraulics and pneumatics.
| 1
|
[
"Antinous (constellation)",
"instance of",
"asterism"
] |
Antinous is an obsolete constellation no longer in use by astronomers, having been merged into Aquila, which it bordered to the north.
The constellation was created by the emperor Hadrian in 132. Antinous was a beautiful youth loved by Hadrian, and also his erotic lover. Cassius Dio, having access to Hadrian's diary now lost, informs that Antinous died either by drowning or (as he himself believed) as a voluntary human sacrifice, something supported by Lambert (1984). The elevation to divinity meant that Antinous was to be a god in the heavens forever – Hadrian having named an asterism in the sky after him.
| 5
|
[
"SN 185",
"instance of",
"supernova remnant"
] |
SN 185 was a transient astronomical event observed in the year AD 185, likely a supernova. The transient occurred in the direction of Alpha Centauri, between the constellations Circinus and Centaurus, centered at RA 14h 43m Dec −62° 30′, in Circinus. This "guest star" was observed by Chinese astronomers in the Book of Later Han (后汉书), and might have been recorded in Roman literature. It remained visible in the night sky for eight months. This is believed to be the first supernova for which records exist.In the 2nd year of the epoch Zhongping [中平], the 10th month, on the day Guihai [癸亥] [December 7, Year 185], a 'guest star' appeared in the middle of the Southern Gate [南門] [an asterism consisting of ε Centauri and α Centauri], The size was half a bamboo mat. It displayed various colors, both pleasing and otherwise. It gradually lessened. In the 6th month of the succeeding year it disappeared.
The gaseous shell RCW 86 is probably the supernova remnant of this event and has a relatively large angular size of roughly 45 arc minutes (larger than the apparent size of the full moon, which varies from 29 to 34 arc minutes). The distance to RCW 86 is estimated to be 2,800 parsecs (9,100 light-years). Recent X-ray studies show a good match for the expected age.Infrared observations from NASA's Spitzer Space Telescope and Wide-field Infrared Survey Explorer (WISE) reveal how the supernova occurred and how its shattered remains ultimately spread out to great distances. The findings show that the stellar explosion took place in a hollowed-out cavity, allowing material expelled by the star to travel much faster and farther than it would have otherwise.Differing modern interpretations of the Chinese records of the guest star have led to quite different suggestions for the astronomical mechanism behind the event, from a core-collapse supernova to a distant, slow-moving comet – with correspondingly wide-ranging estimates of its apparent visual magnitude (−8 to +4). The recent Chandra results suggest that it was most likely a Type Ia supernova (a type with consistent absolute magnitude), and therefore similar to Tycho's Supernova (SN 1572), which had apparent magnitude −4 at a similar distance.
| 3
|
[
"Strettweg cult wagon",
"country",
"Austria"
] |
The Strettweg cult wagon, or Strettweg sacrificial wagon, or Strettweg chariot is a bronze cult wagon from ca. 600 BC, which was found as part of a princely grave of the Hallstatt culture in Strettweg near Judenburg, Austria in 1851. Besides the wagon, other grave goods, like jewelry, bronze amphorae, iron weapons, and horse tack were found.
The wagon consists of a square, open-worked base plate with four spoked wheels. A female figure approx. 32 cm high extending her hands to touch the base of a large bowl with tall, X-shaped supports. Expert analysis has concluded that the bowl cannot be conclusively proven to originally have been part of the cult wagon and may be a later addition. The wagon also contains numerous human figures, both standing and mounted, as well as animals similar to deer and horses. The scene has been interpreted as a sacrifice. The wagon presumably served as a cult object for the consumption of a libation.
The wagon was restored in 2009 and is on display in the Universalmuseum Joanneum at Eggenberg Palace, Graz. A copy is on display in the museum in Judenburg.
According to Marjeta Šašel-Kos (2000), "A deer goddess similar to Artemis must have played an important role in pre-Celtic Noricum, as is indicated by the cult cart from Strettweg, from c. 600 B.C., which represents a goddess (or her priestess) who received deer as a sacrifice, i.e. a kind of a 'Great Nature Goddess'."
| 0
|
[
"Strettweg cult wagon",
"collection",
"Universalmuseum Joanneum"
] |
The Strettweg cult wagon, or Strettweg sacrificial wagon, or Strettweg chariot is a bronze cult wagon from ca. 600 BC, which was found as part of a princely grave of the Hallstatt culture in Strettweg near Judenburg, Austria in 1851. Besides the wagon, other grave goods, like jewelry, bronze amphorae, iron weapons, and horse tack were found.
The wagon consists of a square, open-worked base plate with four spoked wheels. A female figure approx. 32 cm high extending her hands to touch the base of a large bowl with tall, X-shaped supports. Expert analysis has concluded that the bowl cannot be conclusively proven to originally have been part of the cult wagon and may be a later addition. The wagon also contains numerous human figures, both standing and mounted, as well as animals similar to deer and horses. The scene has been interpreted as a sacrifice. The wagon presumably served as a cult object for the consumption of a libation.
The wagon was restored in 2009 and is on display in the Universalmuseum Joanneum at Eggenberg Palace, Graz. A copy is on display in the museum in Judenburg.
According to Marjeta Šašel-Kos (2000), "A deer goddess similar to Artemis must have played an important role in pre-Celtic Noricum, as is indicated by the cult cart from Strettweg, from c. 600 B.C., which represents a goddess (or her priestess) who received deer as a sacrifice, i.e. a kind of a 'Great Nature Goddess'."
| 7
|
[
"Alexander's band",
"facet of",
"double rainbow"
] |
Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described this phenomenon in Aphrodisias, Commentary on Book IV of Aristotle's Meteorology (also known as: Commentary on Book IV of Aristotle's De Meteorologica or On Aristotle's Meteorology 4), commentary 41.The dark band occurs due to the deviation angles of the primary and secondary rainbows. Both bows exist due to an optical effect called the angle of minimum deviation. The refractive index of water prevents light from being deviated at smaller angles. The minimum deviation angle for the primary bow is 137.5°. Light can be deviated up to 180°, causing it to be reflected right back to the observer. Light which is deviated at intermediate angles brightens the inside of the rainbow.
The minimum deviation angle for the secondary bow is about 230°. The fact that this angle is greater than 180° makes the secondary bow an inside-out version of the primary. Its colors are reversed, and light which is deviated at greater angles brightens the sky outside the bow.
Between the two bows lies an area of unlit sky referred to as Alexander's band. Light which is reflected by raindrops in this region of the sky cannot reach the observer, though it may contribute to a rainbow seen by another observer elsewhere.
| 0
|
[
"Alexander's band",
"named after",
"Alexandros of Aphrodisias"
] |
Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described this phenomenon in Aphrodisias, Commentary on Book IV of Aristotle's Meteorology (also known as: Commentary on Book IV of Aristotle's De Meteorologica or On Aristotle's Meteorology 4), commentary 41.The dark band occurs due to the deviation angles of the primary and secondary rainbows. Both bows exist due to an optical effect called the angle of minimum deviation. The refractive index of water prevents light from being deviated at smaller angles. The minimum deviation angle for the primary bow is 137.5°. Light can be deviated up to 180°, causing it to be reflected right back to the observer. Light which is deviated at intermediate angles brightens the inside of the rainbow.
The minimum deviation angle for the secondary bow is about 230°. The fact that this angle is greater than 180° makes the secondary bow an inside-out version of the primary. Its colors are reversed, and light which is deviated at greater angles brightens the sky outside the bow.
Between the two bows lies an area of unlit sky referred to as Alexander's band. Light which is reflected by raindrops in this region of the sky cannot reach the observer, though it may contribute to a rainbow seen by another observer elsewhere.
| 2
|
[
"Alexander's band",
"subclass of",
"atmospheric optical phenomenon"
] |
Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described this phenomenon in Aphrodisias, Commentary on Book IV of Aristotle's Meteorology (also known as: Commentary on Book IV of Aristotle's De Meteorologica or On Aristotle's Meteorology 4), commentary 41.The dark band occurs due to the deviation angles of the primary and secondary rainbows. Both bows exist due to an optical effect called the angle of minimum deviation. The refractive index of water prevents light from being deviated at smaller angles. The minimum deviation angle for the primary bow is 137.5°. Light can be deviated up to 180°, causing it to be reflected right back to the observer. Light which is deviated at intermediate angles brightens the inside of the rainbow.
The minimum deviation angle for the secondary bow is about 230°. The fact that this angle is greater than 180° makes the secondary bow an inside-out version of the primary. Its colors are reversed, and light which is deviated at greater angles brightens the sky outside the bow.
Between the two bows lies an area of unlit sky referred to as Alexander's band. Light which is reflected by raindrops in this region of the sky cannot reach the observer, though it may contribute to a rainbow seen by another observer elsewhere.
| 3
|
[
"Hydroponics",
"subclass of",
"agriculture"
] |
Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions. Terrestrial or aquatic plants may grow with their roots exposed to the nutritious liquid or in addition, the roots may be mechanically supported by an inert medium such as perlite, gravel, or other substrates.Despite inert media, roots can cause changes of the rhizosphere pH and root exudates can affect rhizosphere biology and physiological balance of the nutrient solution by secondary metabolites. Transgenic plants grown hydroponically allow the release of pharmaceutical proteins as part of the root exudate into the hydroponic medium.The nutrients used in hydroponic systems can come from many different organic or inorganic sources, including fish excrement, duck manure, purchased chemical fertilizers, or artificial nutrient solutions.In contrast to field cultivation, plants are commonly grown hydroponically in a greenhouse or contained environment on inert media, adapted to the controlled-environment agriculture (CEA) process. Plants commonly grown hydroponically include tomatoes, peppers, cucumbers, strawberries, lettuces, and cannabis, usually for commercial use, as well as Arabidopsis thaliana, which serves as a model organism in plant science and genetics.Hydroponics offers many advantages, notably a decrease in water usage in agriculture. To grow 1 kilogram (2.2 lb) of tomatoes using intensive farming methods requires 214 liters (47 imp gal; 57 U.S. gal) of water; using hydroponics, 70 liters (15 imp gal; 18 U.S. gal); and only 20 liters (4.4 imp gal; 5.3 U.S. gal) using aeroponics.Hydroponic cultures lead to highest biomass and protein production compared to other growth substrates, of plants cultivated in the same environmental conditions and supplied with equal amounts of nutrients.Since hydroponic growing takes much less water and nutrients to grow produce, and climate change threatens agricultural yields, it could be possible in the future for people in harsh environments with little accessible water to hydroponically grow their own plant-based food.Hydroponics is not only used on Earth, but has also proven itself in plant production experiments in space.
| 2
|
[
"Hydroponics",
"has use",
"horticulture"
] |
Hydroponics is a type of horticulture and a subset of hydroculture which involves growing plants, usually crops or medicinal plants, without soil, by using water-based mineral nutrient solutions. Terrestrial or aquatic plants may grow with their roots exposed to the nutritious liquid or in addition, the roots may be mechanically supported by an inert medium such as perlite, gravel, or other substrates.Despite inert media, roots can cause changes of the rhizosphere pH and root exudates can affect rhizosphere biology and physiological balance of the nutrient solution by secondary metabolites. Transgenic plants grown hydroponically allow the release of pharmaceutical proteins as part of the root exudate into the hydroponic medium.The nutrients used in hydroponic systems can come from many different organic or inorganic sources, including fish excrement, duck manure, purchased chemical fertilizers, or artificial nutrient solutions.In contrast to field cultivation, plants are commonly grown hydroponically in a greenhouse or contained environment on inert media, adapted to the controlled-environment agriculture (CEA) process. Plants commonly grown hydroponically include tomatoes, peppers, cucumbers, strawberries, lettuces, and cannabis, usually for commercial use, as well as Arabidopsis thaliana, which serves as a model organism in plant science and genetics.Hydroponics offers many advantages, notably a decrease in water usage in agriculture. To grow 1 kilogram (2.2 lb) of tomatoes using intensive farming methods requires 214 liters (47 imp gal; 57 U.S. gal) of water; using hydroponics, 70 liters (15 imp gal; 18 U.S. gal); and only 20 liters (4.4 imp gal; 5.3 U.S. gal) using aeroponics.Hydroponic cultures lead to highest biomass and protein production compared to other growth substrates, of plants cultivated in the same environmental conditions and supplied with equal amounts of nutrients.Since hydroponic growing takes much less water and nutrients to grow produce, and climate change threatens agricultural yields, it could be possible in the future for people in harsh environments with little accessible water to hydroponically grow their own plant-based food.Hydroponics is not only used on Earth, but has also proven itself in plant production experiments in space.
| 5
|
[
"SN 386",
"instance of",
"supernova"
] |
SN 386 is a probable transient astronomical event in the constellation Sagittarius, which appeared as a "guest star" that was reported by Chinese astronomers in 386 CE.
| 0
|
[
"Equal-field system",
"country",
"Tang dynasty"
] |
Basis
The system worked on the basis that most land was owned by the government, which would then assign it to individual families. All individuals, including slaves, were entitled to a certain amount of land, the amount depending on their ability to supply labor. For example, able-bodied men received 40 mu of land (around 1.1 hectares or 2.7 acres), and women received less, and more land was granted per ox owned by the family. After they died, the land would revert to the state to be reassigned, but provisions were allowed for inheritance of land that required long-term development, such as farms for mulberry trees (for silkworms).
The system was intended to foster the development of land and to ensure that no agricultural land lay neglected. That prevented aristocrats from developing large power bases by monopolizing the fields and allowed the common people to take part of the land and ensure their livelihood. It also allowed the government to develop a tax base and slowed the accumulation of land by vast, untaxable estates. It was also used by the Tang dynasty to break the dynastic cycle, the idea that all dynasties would end. Having people receive the land from the government would make them feel that the government gave them something even though it never left.
| 1
|
[
"Equal-field system",
"country",
"Northern Wei"
] |
The equal-field system (Chinese: 均田制度; pinyin: Jūntián Zhìdù) or land-equalization system was a system of land ownership and distribution in China used from the Northern Wei to the mid-Tang dynasty.
By the Han dynasty, the well-field system of land distribution had fallen out of use in China though reformers like Wang Mang tried to restore it. The equal-field system was introduced into practice around 485 AD by the Emperor Xiaowen of Northern Wei under the support of Empress Dowager Feng during the Northern and Southern dynasties period. The system was eventually adopted by other regimes, and its use continued into the Sui and Tang dynasties.
| 5
|
[
"Augustinian hypothesis",
"discoverer or inventor",
"Augustine of Hippo"
] |
Origin
The hypothesis takes its name from Augustine of Hippo, an early 5th century bishop and church father, who wrote: "Now, those four evangelists whose names have gained the most remarkable circulation over the whole world, and whose number has been fixed as four, ...are believed to have written in the order which follows: first Matthew, then Mark, thirdly Luke, lastly John." And: "Of these four, it is true, only Matthew is reckoned to have written in the Hebrew language; the others in Greek. And however they may appear to have kept each of them a certain order of narration proper to himself, this certainly is not to be taken as if each individual writer chose to write in ignorance of what his predecessor had done..."Mark was famously dubbed by Augustine as "pedissequus et breviator Matthaei", the attendant and abbreviator of Matthew, in direct contrast to the view most commonly held in academia today, that Mark's gospel was the earliest. Augustine also discussed the commonalities between the Synoptic Gospels, including the identical language found in Matthew, Mark, and Luke. Augustine was not the first to articulate this view, as Irenaeus and Origen, among others, shared this ordering. However, Augustine is the earliest extant author to give a detailed scholarly textual analysis of the three texts' interdependence, and to articulate a theory for the express purpose of explaining this fact.
| 0
|
[
"Augustinian hypothesis",
"facet of",
"Synoptic problem"
] |
The Augustinian hypothesis (sometimes referred to as the Augustinian Proposal) is a solution to the synoptic problem, which concerns the origin of the Gospels of the New Testament. The hypothesis holds that Matthew was written first, by Matthew the Evangelist (see the Gospel According to the Hebrews and the Jewish-Christian Gospels). Mark the Evangelist wrote the Gospel of Mark second and used Matthew and the preaching of Peter as sources. Luke the Evangelist wrote the Gospel of Luke and was aware of the two Gospels that preceded him. Unlike some competing hypotheses, this hypothesis does not rely on, nor does it argue for, the existence of any document that is not explicitly mentioned in historical testimony. Instead, the hypothesis draws primarily upon historical testimony, rather than textual criticism, as the central line of evidence. The foundation of evidence for the hypothesis is the writings of the Church Fathers: historical sources dating back to as early as the first half of the 2nd century, which have been held as authoritative by most Christians for nearly two millennia. Adherents to the Augustinian hypothesis view it as a simple, coherent solution to the synoptic problem.
The Augustinian hypothesis addresses certain fundamental points of contention surrounding the synoptic problem, such as how reliable the early Christian tradition is, which gospel was written first, whether there were other unknown sources behind the gospels, to what extent, if any, the gospels were redacted, and to what extent the gospels were altered between the time they were originally written and the time the first surviving manuscripts appear. These and other matters are raised and alternate resolutions proposed by proponents of competing hypotheses, such as the Two-source hypothesis, its related Q hypothesis, the Farrer hypothesis, and others.
The main two areas of contention within the Augustinian community are whether Matthew was originally written in Aramaic using Hebrew script (see Aramaic primacy), or if the Greek text is the original, and whether it was Mark or Luke who wrote second. A modified version of the Augustinian hypothesis, known as the Griesbach hypothesis, agrees that Matthew wrote first and that Mark depended on Matthew, and does not dispute that the original text was in Hebrew thereafter translated into Greek, but argues that Mark also depended on Luke and therefore that Luke’s gospel precedes Mark's. Because of the similarity on primary points of contention, this hypothesis is also treated as a possible amendment to the Augustinian hypothesis.Augustinian revival
The Augustinian position, and the similar Griesbach hypothesis, has drawn recent interest, especially from B. C. Butler, John Wenham, W.R. Farmer, and others as an alternative solution to the synoptic problem, and has been employed as a scholarly refutation of Marcan priority, the Q hypothesis, and the two-source hypothesis.
Butler argued that accepting the priority of Matthew rendered it possible to dispense with the hypothetical Q document altogether, a position he supported by arguments concerning the inadmissibility of appealing to Q as a sound explanation of the cases where Matthew appears to be more original than Mark.
Likewise it has been pointed out that differences between the Synoptic Gospels are as easily explained by differing purposes of the authors than by forced redactions or omissions due to ignorance. Furthermore, against certain arguments that the “primitiveness” of the ideas within the Gospels is the determining factor in their literary interdependence, it is observed that defining "primitiveness" carries obvious difficulties.Farmer argued that a modification of the Augustinian hypothesis the so called Two-gospel hypothesis, ordering Matthew-Luke-Mark, eliminated all reasons for the existence of Q, a position whose credibility was conceded by W.C. Allen and others. Bernard Orchard also developed the Two-gospel hypothesis and suggested a plausible historic scenario that merged its ideas with the historic evidence that underlines the Augustinian hypothesis.
| 1
|
[
"Greek fire",
"instance of",
"incendiary weapon"
] |
Greek fire was an incendiary weapon used by the Eastern Roman Empire beginning AD 672. Used to set enemy ships on fire, it consisted of a combustible compound emitted by a flame-throwing weapon. Some historians said it could be ignited on contact with water, and was probably based on naphtha and quicklime. The Byzantines typically used it in naval battles to great effect, as it could continue burning while floating on water. The technological advantage it provided was responsible for many key Byzantine military victories, most notably the salvation of Constantinople from the first and second Arab sieges, thus securing the empire's survival.
The impression made by Greek fire on the western European Crusaders was such that the name was applied to any sort of incendiary weapon, including those used by Arabs, the Chinese, and the Mongols. However, these mixtures used formulas different from that of Byzantine Greek fire, which was a closely guarded state secret. Byzantines also used pressurized nozzles to project the liquid onto the enemy, in a manner resembling a modern flamethrower.
The composition of Greek fire remains a matter of speculation and debate, with various proposals including combinations of pine resin, naphtha, quicklime, calcium phosphide, sulfur, or niter.
| 2
|
[
"Man'yōgana",
"subclass of",
"kana"
] |
Man'yōgana (万葉仮名, Japanese pronunciation: [maɰ̃joꜜːɡana] or [maɰ̃joːɡana]) is an ancient writing system that uses Chinese characters to represent the Japanese language. It was the first known kana system to be developed as a means to represent the Japanese language phonetically. The date of the earliest usage of this type of kana is not clear, but it was in use since at least the mid-7th century. The name "man'yōgana" derives from the Man'yōshū, a Japanese poetry anthology from the Nara period written with man'yōgana.
Texts using the system also often use Chinese characters for their meaning, but man'yōgana refers to such characters only when used to represent a phonetic value. The values were derived from the contemporary Chinese pronunciation, but native Japanese readings of the character were also sometimes used. For example, 木 (whose character means 'tree') could represent either /mo/ (based on Middle Chinese [məwk]) or /ko/ or /kwi/ (meaning 'tree' in Old Japanese).Simplified versions of man'yōgana eventually gave rise to both the hiragana and katakana scripts, which are used in Modern Japanese.
| 2
|
[
"Man'yōgana",
"named after",
"Man'yōshū"
] |
Man'yōgana (万葉仮名, Japanese pronunciation: [maɰ̃joꜜːɡana] or [maɰ̃joːɡana]) is an ancient writing system that uses Chinese characters to represent the Japanese language. It was the first known kana system to be developed as a means to represent the Japanese language phonetically. The date of the earliest usage of this type of kana is not clear, but it was in use since at least the mid-7th century. The name "man'yōgana" derives from the Man'yōshū, a Japanese poetry anthology from the Nara period written with man'yōgana.
Texts using the system also often use Chinese characters for their meaning, but man'yōgana refers to such characters only when used to represent a phonetic value. The values were derived from the contemporary Chinese pronunciation, but native Japanese readings of the character were also sometimes used. For example, 木 (whose character means 'tree') could represent either /mo/ (based on Middle Chinese [məwk]) or /ko/ or /kwi/ (meaning 'tree' in Old Japanese).Simplified versions of man'yōgana eventually gave rise to both the hiragana and katakana scripts, which are used in Modern Japanese.
| 5
|
[
"Insular script",
"based on",
"half uncial"
] |
Insular script was a medieval script system originating from Ireland that spread to Anglo-Saxon England and continental Europe under the influence of Irish Christianity. Irish missionaries took the script to continental Europe, where they founded monasteries such as Bobbio. The scripts were also used in monasteries like Fulda, which were influenced by English missionaries. They are associated with Insular art, of which most surviving examples are illuminated manuscripts. It greatly influenced Irish orthography and modern Gaelic scripts in handwriting and typefaces.
Insular script comprised a diverse family of scripts used for different functions. At the top of the hierarchy was the Insular half-uncial (or "Insular majuscule"), used for important documents and sacred text. The full uncial, in a version called "English uncial", was used in some English centres. Then "in descending order of formality and increased speed of writing" came "set minuscule", "cursive minuscule" and "current minuscule". These were used for non-scriptural texts, letters, accounting records, notes, and all the other types of written documents.Origin
The scripts developed in Ireland in the 7th century and were used as late as the 19th century, though its most flourishing period fell between 600 and 850. They were closely related to the uncial and half-uncial scripts, their immediate influences; the highest grade of Insular script is the majuscule Insular half-uncial, which is closely derived from Continental half-uncial script.
| 5
|
[
"Shō (instrument)",
"subclass of",
"free reeds"
] |
The shō (笙) is a Japanese free reed musical instrument that was introduced from China during the Nara period (AD 710 to 794). It is descended from the Chinese sheng, of the Tang Dynasty era, although the shō tends to be smaller in size than its contemporary sheng relatives. It consists of 17 slender bamboo pipes, each of which is fitted in its base with a metal free reed. Two of the pipes are silent, although research suggests that they were used in some music during the Heian period. It is speculated that even though the pipes are silent, they were kept as part of the instrument to keep the symmetrical shape.The instrument's sound is said to imitate the call of a phoenix, and it is for this reason that the two silent pipes of the shō are kept—as an aesthetic element, making two symmetrical "wings". Similar to the Chinese sheng, the pipes are tuned carefully with a drop of a dense resinous wax preparation containing fine lead shot. As (breath) moisture collected in the shō's pipes prevents it from sounding, performers can be seen warming the instrument over a small charcoal brazier or electric burner when they are not playing. The instrument produces sound when the player's breath is inhaled or exhaled, allowing long periods of uninterrupted play. The shō is one of the three primary woodwind instruments used in gagaku, Japan's imperial court music. Its traditional playing technique in gagaku involves the use of tone clusters called aitake (合竹), which move gradually from one to the other, providing accompaniment to the melody.
A larger size of shō, called u (derived from the Chinese yu), is little used, although some performers, such as Hiromi Yoshida and Ko Ishikawa, began to revive it in the late 20th century.
| 1
|
[
"Shō (instrument)",
"subclass of",
"traditional Japanese musical instrument"
] |
The shō (笙) is a Japanese free reed musical instrument that was introduced from China during the Nara period (AD 710 to 794). It is descended from the Chinese sheng, of the Tang Dynasty era, although the shō tends to be smaller in size than its contemporary sheng relatives. It consists of 17 slender bamboo pipes, each of which is fitted in its base with a metal free reed. Two of the pipes are silent, although research suggests that they were used in some music during the Heian period. It is speculated that even though the pipes are silent, they were kept as part of the instrument to keep the symmetrical shape.The instrument's sound is said to imitate the call of a phoenix, and it is for this reason that the two silent pipes of the shō are kept—as an aesthetic element, making two symmetrical "wings". Similar to the Chinese sheng, the pipes are tuned carefully with a drop of a dense resinous wax preparation containing fine lead shot. As (breath) moisture collected in the shō's pipes prevents it from sounding, performers can be seen warming the instrument over a small charcoal brazier or electric burner when they are not playing. The instrument produces sound when the player's breath is inhaled or exhaled, allowing long periods of uninterrupted play. The shō is one of the three primary woodwind instruments used in gagaku, Japan's imperial court music. Its traditional playing technique in gagaku involves the use of tone clusters called aitake (合竹), which move gradually from one to the other, providing accompaniment to the melody.
A larger size of shō, called u (derived from the Chinese yu), is little used, although some performers, such as Hiromi Yoshida and Ko Ishikawa, began to revive it in the late 20th century.
| 4
|
[
"Gunpowder",
"has part(s)",
"charcoal"
] |
Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). The sulfur and carbon act as fuels while the saltpeter is an oxidizer. Gunpowder has been widely used as a propellant in firearms, artillery, rocketry, and pyrotechnics, including use as a blasting agent for explosives in quarrying, mining, building pipelines and road building.
Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance. Low explosives deflagrate (i.e., burn at subsonic speeds), whereas high explosives detonate, producing a supersonic shockwave. Ignition of gunpowder packed behind a projectile generates enough pressure to force the shot from the muzzle at high speed, but usually not enough force to rupture the gun barrel. It thus makes a good propellant but is less suitable for shattering rock or fortifications with its low-yield explosive power. Nonetheless, it was widely used to fill fused artillery shells (and used in mining and civil engineering projects) until the second half of the 19th century, when the first high explosives were put into use.
Gunpowder is one of the Four Great Inventions of China. Originally developed by the Taoists for medicinal purposes, it was first used for warfare around 904 AD. Its use in weapons has declined due to smokeless powder replacing it, and it is no longer used for industrial purposes due to its relative inefficiency compared to newer alternatives such as dynamite and ammonium nitrate/fuel oil.Other compositions
Besides black powder, there are other historically important types of gunpowder. "Brown gunpowder" is cited as composed of 79% nitre, 3% sulfur, and 18% charcoal per 100 of dry powder, with about 2% moisture. Prismatic Brown Powder is a large-grained product the Rottweil Company introduced in 1884 in Germany, which was adopted by the British Royal Navy shortly thereafter. The French navy adopted a fine, 3.1 millimeter, not prismatic grained product called Slow Burning Cocoa (SBC) or "cocoa powder". These brown powders reduced burning rate even further by using as little as 2 percent sulfur and using charcoal made from rye straw that had not been completely charred, hence the brown color.Lesmok powder was a product developed by DuPont in 1911, one of several semi-smokeless products in the industry containing a mixture of black and nitrocellulose powder. It was sold to Winchester and others primarily for .22 and .32 small calibers. Its advantage was that it was believed at the time to be less corrosive than smokeless powders then in use. It was not understood in the U.S. until the 1920s that the actual source of corrosion was the potassium chloride residue from potassium chlorate sensitized primers. The bulkier black powder fouling better disperses primer residue. Failure to mitigate primer corrosion by dispersion caused the false impression that nitrocellulose-based powder caused corrosion. Lesmok had some of the bulk of black powder for dispersing primer residue, but somewhat less total bulk than straight black powder, thus requiring less frequent bore cleaning. It was last sold by Winchester in 1947.2 KNO3 + S + 3 C → K2S + N2 + 3 CO2.A balanced, but still simplified, equation is:
10 KNO3 + 3 S + 8 C → 2 K2CO3 + 3 K2SO4 + 6 CO2 + 5 N2.The exact percentages of ingredients varied greatly through the medieval period as the recipes were developed by trial and error, and needed to be updated for changing military technology.Gunpowder does not burn as a single reaction, so the byproducts are not easily predicted. One study showed that it produced (in order of descending quantities) 55.91% solid products: potassium carbonate, potassium sulfate, potassium sulfide, sulfur, potassium nitrate, potassium thiocyanate, carbon, ammonium carbonate and 42.98% gaseous products: carbon dioxide, nitrogen, carbon monoxide, hydrogen sulfide, hydrogen, methane, 1.11% water.
Gunpowder made with less-expensive and more plentiful sodium nitrate instead of potassium nitrate (in appropriate proportions) works just as well. However, it is more hygroscopic than powders made from potassium nitrate. Muzzleloaders have been known to fire after hanging on a wall for decades in a loaded state, provided they remained dry. By contrast, gunpowder made with sodium nitrate must be kept sealed to remain stable.
Gunpowder releases 3 megajoules per kilogram and contains its own oxidant. This is less than TNT (4.7 megajoules per kilogram), or gasoline (47.2 megajoules per kilogram in combustion, but gasoline requires an oxidant; for instance, an optimized gasoline and O2 mixture releases 10.4 megajoules per kilogram, taking into account the mass of the oxygen).
Gunpowder also has a low energy density compared to modern "smokeless" powders, and thus to achieve high energy loadings, large amounts are needed with heavy projectiles.Production
For the most powerful black powder, meal powder, a wood charcoal, is used. The best wood for the purpose is Pacific willow, but others such as alder or buckthorn can be used. In Great Britain between the 15th and 19th centuries charcoal from alder buckthorn was greatly prized for gunpowder manufacture; cottonwood was used by the American Confederate States. The ingredients are reduced in particle size and mixed as intimately as possible. Originally, this was with a mortar-and-pestle or a similarly operating stamping-mill, using copper, bronze or other non-sparking materials, until supplanted by the rotating ball mill principle with non-sparking bronze or lead. Historically, a marble or limestone edge runner mill, running on a limestone bed, was used in Great Britain; however, by the mid 19th century this had changed to either an iron-shod stone wheel or a cast iron wheel running on an iron bed. The mix was dampened with alcohol or water during grinding to prevent accidental ignition. This also helps the extremely soluble saltpeter to mix into the microscopic pores of the very high surface-area charcoal.
Around the late 14th century, European powdermakers first began adding liquid during grinding to improve mixing, reduce dust, and with it the risk of explosion. The powder-makers would then shape the resulting paste of dampened gunpowder, known as mill cake, into corns, or grains, to dry. Not only did corned powder keep better because of its reduced surface area, gunners also found that it was more powerful and easier to load into guns. Before long, powder-makers standardized the process by forcing mill cake through sieves instead of corning powder by hand.
The improvement was based on reducing the surface area of a higher density composition. At the beginning of the 19th century, makers increased density further by static pressing. They shoveled damp mill cake into a two-foot square box, placed this beneath a screw press and reduced it to half its volume. "Press cake" had the hardness of slate. They broke the dried slabs with hammers or rollers, and sorted the granules with sieves into different grades. In the United States, Eleuthere Irenee du Pont, who had learned the trade from Lavoisier, tumbled the dried grains in rotating barrels to round the edges and increase durability during shipping and handling. (Sharp grains rounded off in transport, producing fine "meal dust" that changed the burning properties.)
Another advance was the manufacture of kiln charcoal by distilling wood in heated iron retorts instead of burning it in earthen pits. Controlling the temperature influenced the power and consistency of the finished gunpowder. In 1863, in response to high prices for Indian saltpeter, DuPont chemists developed a process using potash or mined potassium chloride to convert plentiful Chilean sodium nitrate to potassium nitrate.The following year (1864) the Gatebeck Low Gunpowder Works in Cumbria (Great Britain) started a plant to manufacture potassium nitrate by essentially the same chemical process. This is nowadays called the 'Wakefield Process', after the owners of the company. It would have used potassium chloride from the Staßfurt mines, near Magdeburg, Germany, which had recently become available in industrial quantities.During the 18th century, gunpowder factories became increasingly dependent on mechanical energy. Despite mechanization, production difficulties related to humidity control, especially during the pressing, were still present in the late 19th century. A paper from 1885 laments that "Gunpowder is such a nervous and sensitive spirit, that in almost every process of manufacture it changes under our hands as the weather changes." Pressing times to the desired density could vary by a factor of three depending on the atmospheric humidity.
| 6
|
[
"Gunpowder",
"has part(s)",
"potassium nitrate"
] |
Components
Gunpowder is a granular mixture of:a nitrate, typically potassium nitrate (KNO3), which supplies oxygen for the reaction;
charcoal, which provides carbon and other fuel for the reaction, simplified as carbon (C);
sulfur (S), which, while also serving as a fuel, lowers the temperature required to ignite the mixture, thereby increasing the rate of combustion.Potassium nitrate is the most important ingredient in terms of both bulk and function because the combustion process releases oxygen from the potassium nitrate, promoting the rapid burning of the other ingredients. To reduce the likelihood of accidental ignition by static electricity, the granules of modern gunpowder are typically coated with graphite, which prevents the build-up of electrostatic charge.
Charcoal does not consist of pure carbon; rather, it consists of partially pyrolyzed cellulose, in which the wood is not completely decomposed. Carbon differs from ordinary charcoal. Whereas charcoal's autoignition temperature is relatively low, carbon's is much greater. Thus, a gunpowder composition containing pure carbon would burn similarly to a match head, at best.The current standard composition for the gunpowder manufactured by pyrotechnicians was adopted as long ago as 1780. Proportions by weight are 75% potassium nitrate (known as saltpeter or saltpetre), 15% softwood charcoal, and 10% sulfur. These ratios have varied over the centuries and by country, and can be altered somewhat depending on the purpose of the powder. For instance, power grades of black powder, unsuitable for use in firearms but adequate for blasting rock in quarrying operations, are called blasting powder rather than gunpowder with standard proportions of 70% nitrate, 14% charcoal, and 16% sulfur; blasting powder may be made with the cheaper sodium nitrate substituted for potassium nitrate and proportions may be as low as 40% nitrate, 30% charcoal, and 30% sulfur. In 1857, Lammot du Pont solved the main problem of using cheaper sodium nitrate formulations when he patented DuPont "B" blasting powder. After manufacturing grains from press-cake in the usual way, his process tumbled the powder with graphite dust for 12 hours. This formed a graphite coating on each grain that reduced its ability to absorb moisture.Neither the use of graphite nor sodium nitrate was new. Glossing gunpowder corns with graphite was already an accepted technique in 1839, and sodium nitrate-based blasting powder had been made in Peru for many years using the sodium nitrate mined at Tarapacá (now in Chile). Also, in 1846, two plants were built in south-west England to make blasting powder using this sodium nitrate. The idea may well have been brought from Peru by Cornish miners returning home after completing their contracts. Another suggestion is that it was William Lobb, the plant collector, who recognised the possibilities of sodium nitrate during his travels in South America. Lammot du Pont would have known about the use of graphite and probably also knew about the plants in south-west England. In his patent he was careful to state that his claim was for the combination of graphite with sodium nitrate-based powder, rather than for either of the two individual technologies.
French war powder in 1879 used the ratio 75% saltpeter, 12.5% charcoal, 12.5% sulfur. English war powder in 1879 used the ratio 75% saltpeter, 15% charcoal, 10% sulfur. The British Congreve rockets used 62.4% saltpeter, 23.2% charcoal and 14.4% sulfur, but the British Mark VII gunpowder was changed to 65% saltpeter, 20% charcoal and 15% sulfur. The explanation for the wide variety in formulation relates to usage. Powder used for rocketry can use a slower burn rate since it accelerates the projectile for a much longer time—whereas powders for weapons such as flintlocks, cap-locks, or matchlocks need a higher burn rate to accelerate the projectile in a much shorter distance. Cannons usually used lower burn-rate powders, because most would burst with higher burn-rate powders.
| 9
|
[
"Gunpowder",
"instance of",
"mixture"
] |
Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). The sulfur and carbon act as fuels while the saltpeter is an oxidizer. Gunpowder has been widely used as a propellant in firearms, artillery, rocketry, and pyrotechnics, including use as a blasting agent for explosives in quarrying, mining, building pipelines and road building.
Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance. Low explosives deflagrate (i.e., burn at subsonic speeds), whereas high explosives detonate, producing a supersonic shockwave. Ignition of gunpowder packed behind a projectile generates enough pressure to force the shot from the muzzle at high speed, but usually not enough force to rupture the gun barrel. It thus makes a good propellant but is less suitable for shattering rock or fortifications with its low-yield explosive power. Nonetheless, it was widely used to fill fused artillery shells (and used in mining and civil engineering projects) until the second half of the 19th century, when the first high explosives were put into use.
Gunpowder is one of the Four Great Inventions of China. Originally developed by the Taoists for medicinal purposes, it was first used for warfare around 904 AD. Its use in weapons has declined due to smokeless powder replacing it, and it is no longer used for industrial purposes due to its relative inefficiency compared to newer alternatives such as dynamite and ammonium nitrate/fuel oil.
| 16
|
[
"Asama Onsen",
"instance of",
"onsen"
] |
Asama Onsen (浅間温泉) is an onsen located in the city of Matsumoto, Nagano Prefecture, Japan.
The Asama Hot Spring Center, also known as the Hot Plaza Hall, has a configuration typical of many Japanese onsen with separate areas for males and females; each area contains multiple indoor pools, saunas and two outdoor pools, one hot and one cold. The published temperature range of this onsen is 42-47 degrees Celsius.
Between 1969 and 2011, Asama Onsen included an open-air speed skating rink.
| 2
|
[
"Andromeda Galaxy",
"instance of",
"spiral galaxy"
] |
The Andromeda Galaxy (also known as Messier 31, M31, NGC 224 and originally the Andromeda Nebula) is a barred spiral galaxy and is the closest major galaxy to the Milky Way, where the Solar System resides. It has a diameter of about 46.56 kiloparsecs (152,000 light-years) and is approximately 765 kpc (2.5 million light-years) from Earth. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda, which itself is named after the princess who was the wife of Perseus in Greek mythology.
The virial mass of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillion solar masses (2.0×1042 kilograms). The mass of either galaxy is difficult to estimate with any accuracy, but it was long thought that the Andromeda Galaxy was more massive than the Milky Way by a margin of some 25% to 50%. This has been called into question by early 21st-century studies indicating a possibly lower mass for the Andromeda Galaxy
and a higher mass for the Milky Way. The Andromeda Galaxy has a diameter of about 46.56 kpc (152,000 ly), making it the largest member of the Local Group in terms of extension.
The Milky Way and Andromeda galaxies are expected to collide in around 4–5 billion years, merging to potentially form a giant elliptical galaxy or a large lenticular galaxy.
With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects, and is visible to the naked eye from Earth on moonless nights, even when viewed from areas with moderate light pollution.Structure
Based on its appearance in visible light, the Andromeda Galaxy is classified as an SA(s)b galaxy in the de Vaucouleurs–Sandage extended classification system of spiral galaxies. However, infrared data from the 2MASS survey and the Spitzer Space Telescope showed that Andromeda is actually a barred spiral galaxy, like the Milky Way, with Andromeda's bar major axis oriented 55 degrees anti-clockwise from the disc major axis.There are various methods used in astronomy in defining the size of a galaxy, and each method can yield different results concerning one another. The most commonly employed is the D25 standard - the isophote where the photometric brightness of a galaxy in the B-band (445 nm wavelength of light, in the blue part of the visible spectrum) reaches 25 mag/arcsec2. The Third Reference Catalogue of Bright Galaxies (RC3) used this standard for Andromeda in 1991, yielding an isophotal diameter of 46.56 kiloparsecs (152,000 light-years) at a distance of 2.5 million light-years. An earlier estimate from 1981 gave a diameter for Andromeda at 54 kiloparsecs (176,000 light-years).A study in 2005 by the Keck telescopes shows the existence of a tenuous sprinkle of stars, or galactic halo, extending outward from the galaxy. The stars in this halo behave differently from the ones in Andromeda's main galactic disc, where they show rather disorganized orbital motions as opposed to the stars in the main disc having more orderly orbits and uniform velocities of 200 km/s. This diffuse halo extends outwards away from Andromeda's main disc with the diameter of 67.45 kiloparsecs (220,000 light-years).The galaxy is inclined an estimated 77° relative to Earth (where an angle of 90° would be edge-on). Analysis of the cross-sectional shape of the galaxy appears to demonstrate a pronounced, S-shaped warp, rather than just a flat disk. A possible cause of such a warp could be gravitational interaction with the satellite galaxies near the Andromeda Galaxy. The Galaxy M33 could be responsible for some warp in Andromeda's arms, though more precise distances and radial velocities are required.
Spectroscopic studies have provided detailed measurements of the rotational velocity of the Andromeda Galaxy as a function of radial distance from the core. The rotational velocity has a maximum value of 225 km/s (140 mi/s) at 1,300 ly (82,000,000 AU) from the core, and it has its minimum possibly as low as 50 km/s (31 mi/s) at 7,000 ly (440,000,000 AU) from the core. Further out, rotational velocity rises out to a radius of 33,000 ly (2.1×109 AU), where it reaches a peak of 250 km/s (160 mi/s). The velocities slowly decline beyond that distance, dropping to around 200 km/s (120 mi/s) at 80,000 ly (5.1×109 AU). These velocity measurements imply a concentrated mass of about 6×109 M☉ in the nucleus. The total mass of the galaxy increases linearly out to 45,000 ly (2.8×109 AU), then more slowly beyond that radius.The spiral arms of the Andromeda Galaxy are outlined by a series of HII regions, first studied in great detail by Walter Baade and described by him as resembling "beads on a string". His studies show two spiral arms that appear to be tightly wound, although they are more widely spaced than in our galaxy. His descriptions of the spiral structure, as each arm crosses the major axis of the Andromeda Galaxy, are as follows§pp1062§pp92:
| 0
|
[
"Andromeda Galaxy",
"named after",
"Andromeda"
] |
The Andromeda Galaxy (also known as Messier 31, M31, NGC 224 and originally the Andromeda Nebula) is a barred spiral galaxy and is the closest major galaxy to the Milky Way, where the Solar System resides. It has a diameter of about 46.56 kiloparsecs (152,000 light-years) and is approximately 765 kpc (2.5 million light-years) from Earth. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda, which itself is named after the princess who was the wife of Perseus in Greek mythology.
The virial mass of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillion solar masses (2.0×1042 kilograms). The mass of either galaxy is difficult to estimate with any accuracy, but it was long thought that the Andromeda Galaxy was more massive than the Milky Way by a margin of some 25% to 50%. This has been called into question by early 21st-century studies indicating a possibly lower mass for the Andromeda Galaxy
and a higher mass for the Milky Way. The Andromeda Galaxy has a diameter of about 46.56 kpc (152,000 ly), making it the largest member of the Local Group in terms of extension.
The Milky Way and Andromeda galaxies are expected to collide in around 4–5 billion years, merging to potentially form a giant elliptical galaxy or a large lenticular galaxy.
With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects, and is visible to the naked eye from Earth on moonless nights, even when viewed from areas with moderate light pollution.
| 3
|
[
"Brocchi's Cluster",
"discoverer or inventor",
"Abd al-Rahman al-Sufi"
] |
Brocchi's Cluster (also known as Collinder 399, Cr 399 or Al Sufi's Cluster) is a asterism of six stars in an apparent row, across 1.3° of the night sky and four others, in the south of the constellation Vulpecula, thus near Sagitta. Its nickname is the Coathanger. None of these ten stars are believed to be much gravitationally associated, so not a star cluster, a fact not known until 1997. An additional 30 or so much fainter stars to terrestrial observers are sometimes considered to be associated.History
It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964.
In the 17th century, it was independently rediscovered by the Italian astronomer G. B. Hodierna.
In the 1920s, Dalmero Francis Brocchi, an amateur astronomer and chart maker for the American Association of Variable Star Observers (AAVSO), created a map of the stars for use in calibrating photometers.
In 1931, Swedish astronomer Per Collinder listed it in his catalogue of open clusters.
| 2
|
[
"Large Magellanic Cloud",
"named after",
"Ferdinand Magellan"
] |
Ferdinand Magellan sighted the LMC on his voyage in 1519 and his writings brought it into common Western knowledge. The galaxy now bears his name.
The galaxy and southern end of Dorado are in the current epoch at opposition on about 5 December when thus visible from sunset to sunrise from equatorial points such as Ecuador, the Congos, Uganda, Kenya and Indonesia and for part of the night in nearby months. Above about 28° south, such as most of Australia and South Africa, the galaxy is always sufficiently above the horizon to be considered properly circumpolar, thus spring and autumn also are seasons of much-of-night visibility, and the height of winter in June nearly coincides with closest proximity to the Sun's apparent position.
Measurements with the Hubble Space Telescope, announced in 2006, suggest the Large and Small Magellanic Clouds may be moving too quickly to be orbiting the Milky Way.Astronomers discovered a new black hole inside the Large Magellanic Cloud in November 2021 using the European Southern Observatory's Very Large Telescope in Chile. Astronomers claim its gravity is influenced by a nearby star, which is about five times the mass of the Sun.
| 2
|
[
"Large Magellanic Cloud",
"instance of",
"dwarf galaxy"
] |
The Large Magellanic Cloud (LMC) is a satellite galaxy of the Milky Way. At a distance of around 50 kiloparsecs (160 kly), the LMC is the second- or third-closest galaxy to the Milky Way, after the Sagittarius Dwarf Spheroidal (c. 16 kpc (52 kly) away) and the possible dwarf irregular galaxy called the Canis Major Overdensity. Based on the D25 isophote at the B-band (445 nm wavelength of light), the Large Magellanic Cloud is about 9.86 kpc (32.2 kly) across. It is roughly one-hundredth the mass of the Milky Way and is the fourth-largest galaxy in the Local Group, after the Andromeda Galaxy (M31), the Milky Way, and the Triangulum Galaxy (M33).
The LMC is classified as a Magellanic spiral. It contains a stellar bar that is geometrically off center, suggesting that it was a barred dwarf spiral galaxy before its spiral arms were disrupted, likely by tidal interactions from the Small Magellanic Cloud (SMC) and the Milky Way's gravity.With a declination of about −70°, the LMC is visible as a faint "cloud" from the southern hemisphere of the Earth and from as far north as 20° N. It straddles the constellations Dorado and Mensa and has an apparent length of about 10° to the naked eye, 20 times the Moon's diameter, from dark sites away from light pollution.The Milky Way and the LMC are predicted to merge in approximately 2.4 billion years.
| 11
|
[
"Thuluth",
"part of",
"Arabic calligraphy"
] |
History
The greatest contributions to the evolution of the Thuluth script occurred in the Ottoman Empire in three successive steps that Ottoman art historians call "calligraphical revolutions":The first revolution occurred in the 15th century and was initiated by the master calligrapher Sheikh Hamdullah.
The second revolution resulted from the work of the Ottoman calligrapher Hâfız Osman in the 17th century.
Finally, in the late 19th century, Mehmed Şevkî Efendi gave the script the distinctive shape it has today.Artists
The best known artist to write the Thuluth script at its zenith is said to be Mustafa Râkım Efendi (1757–1826), a painter who set a standard in Ottoman calligraphy which many believe has not been surpassed to this day.
| 2
|
[
"Thuluth",
"instance of",
"script"
] |
Thuluth (Arabic: ثُلُث, Ṯuluṯ or Arabic: خَطُّ الثُّلُثِ, Ḵaṭṭ-uṯ-Ṯuluṯ; Persian: ثلث, Sols; Turkish: Sülüs, from thuluth "one-third") is a script variety of Islamic calligraphy. The straight angular forms of Kufic were replaced in the new script by curved and oblique lines. In Thuluth, one-third of each letter slopes, from which the name (meaning "a third" in Arabic) comes. An alternative theory to the meaning is that the smallest width of the letter is one third of the widest part. It is an elegant, cursive script, used in medieval times on mosque decorations. Various calligraphic styles evolved from Thuluth through slight changes of form.History
The greatest contributions to the evolution of the Thuluth script occurred in the Ottoman Empire in three successive steps that Ottoman art historians call "calligraphical revolutions":The first revolution occurred in the 15th century and was initiated by the master calligrapher Sheikh Hamdullah.
The second revolution resulted from the work of the Ottoman calligrapher Hâfız Osman in the 17th century.
Finally, in the late 19th century, Mehmed Şevkî Efendi gave the script the distinctive shape it has today.
| 3
|
[
"SN 1006",
"instance of",
"supernova"
] |
SN 1006 was a supernova that is likely the brightest observed stellar event in recorded history, reaching an estimated −7.5 visual magnitude, and exceeding roughly sixteen times the brightness of Venus. Appearing between April 30 and May 1, 1006, in the constellation of Lupus, this "guest star" was described by observers across China, Japan, modern-day Iraq, Egypt, and Europe, and was possibly recorded in North American petroglyphs. Some reports state it was clearly visible in the daytime. Modern astronomers now consider its distance from Earth to be about 2,200 parsecs.
| 2
|
[
"SN 1054",
"instance of",
"supernova"
] |
SN 1054 is a supernova that was first observed on c. 4 July 1054, and remained visible until c. 6 April 1056.αThe event was recorded in contemporary Chinese astronomy, and references to it are also found in a later (13th-century) Japanese document, and in a document from the Islamic world. Furthermore, there are a number of proposed, but doubtful, references from European sources recorded in the 15th century, and perhaps a pictograph associated with the Ancestral Puebloan culture found near the Peñasco Blanco site in New Mexico, United States.
The remnant of SN 1054, which consists of debris ejected during the explosion, is known as the Crab Nebula. It is located in the sky near the star Zeta Tauri (ζ Tauri). The core of the exploding star formed a pulsar, called the Crab Pulsar (or PSR B0531+21). The nebula and the pulsar that it contains are some of the most studied astronomical objects outside the Solar System. It is one of the few Galactic supernovae where the date of the explosion is well known. The two objects are the most luminous in their respective categories. For these reasons, and because of the important role it has repeatedly played in the modern era, SN 1054 is one of the best known supernovae in the history of astronomy.
The Crab Nebula is easily observed by amateur astronomers thanks to its brightness, and was also catalogued early on by professional astronomers, long before its true nature was understood and identified. When the French astronomer Charles Messier watched for the return of Halley's Comet in 1758, he confused the nebula for the comet, as he was unaware of the former's existence. Motivated by this error, he created his catalogue of non-cometary nebulous objects, the Messier Catalogue, to avoid such mistakes in the future. The nebula is catalogued as the first Messier object, or M1.
| 1
|
[
"SN 1054",
"instance of",
"star"
] |
SN 1054 is a supernova that was first observed on c. 4 July 1054, and remained visible until c. 6 April 1056.αThe event was recorded in contemporary Chinese astronomy, and references to it are also found in a later (13th-century) Japanese document, and in a document from the Islamic world. Furthermore, there are a number of proposed, but doubtful, references from European sources recorded in the 15th century, and perhaps a pictograph associated with the Ancestral Puebloan culture found near the Peñasco Blanco site in New Mexico, United States.
The remnant of SN 1054, which consists of debris ejected during the explosion, is known as the Crab Nebula. It is located in the sky near the star Zeta Tauri (ζ Tauri). The core of the exploding star formed a pulsar, called the Crab Pulsar (or PSR B0531+21). The nebula and the pulsar that it contains are some of the most studied astronomical objects outside the Solar System. It is one of the few Galactic supernovae where the date of the explosion is well known. The two objects are the most luminous in their respective categories. For these reasons, and because of the important role it has repeatedly played in the modern era, SN 1054 is one of the best known supernovae in the history of astronomy.
The Crab Nebula is easily observed by amateur astronomers thanks to its brightness, and was also catalogued early on by professional astronomers, long before its true nature was understood and identified. When the French astronomer Charles Messier watched for the return of Halley's Comet in 1758, he confused the nebula for the comet, as he was unaware of the former's existence. Motivated by this error, he created his catalogue of non-cometary nebulous objects, the Messier Catalogue, to avoid such mistakes in the future. The nebula is catalogued as the first Messier object, or M1.Ibn Butlan (Iraq)
While SN 1006, which was significantly brighter than SN 1054, was mentioned by several Arab chroniclers, there exist no Arabic reports relating to the rather faint SN 1181.
Only one Arabic account has been found concerning SN 1054, whose brightness is between those of the last two stars mentioned. This account, discovered in 1978, is that of a Nestorian Christian doctor, Ibn Butlan, transcribed in the Uyun al-Anba, a book on detailed biographies of physicians in the Islamic world compiled by Ibn Abi Usaybi'a (1194–1270) in the mid-thirteenth century. This is a translation of the passage in question:The three years cited (AH 445, 446, 447) refer, respectively, to: 23 April 1053 – 11 April 1054, 12 April 1054 – 1 April 1055, and 2 April 1055 – 20 March 1056. There is an apparent inconsistency in the year of occurrence of the star, first announced as 446, then 445. This problem is solved by reading other entries in the book, which quite explicitly specify that the Nile was low at 446.
This year of the Muslim calendar ran from 12 April 1054 to 1 April 1055, which is compatible with the appearance of the star in July 1054, as its location (admittedly rather vague), is in the astrological sign of Gemini (which, due to axial precession, covers the eastern part of the Constellation Taurus). The date of the event in 446 is harder to determine, but the reference to the level of the Nile refers to the period preceding its annual flood, which happens during the summer.
| 4
|
[
"Tangent (trigonometry)",
"opposite of",
"cotangent"
] |
In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are real functions which relate an angle of a right-angled triangle to ratios of two side lengths. They are widely used in all sciences that are related to geometry, such as navigation, solid mechanics, celestial mechanics, geodesy, and many others. They are among the simplest periodic functions, and as such are also widely used for studying periodic phenomena through Fourier analysis.
The trigonometric functions most widely used in modern mathematics are the sine, the cosine, and the tangent. Their reciprocals are respectively the cosecant, the secant, and the cotangent, which are less used. Each of these six trigonometric functions has a corresponding inverse function, and an analog among the hyperbolic functions.
The oldest definitions of trigonometric functions, related to right-angle triangles, define them only for acute angles. To extend the sine and cosine functions to functions whose domain is the whole real line, geometrical definitions using the standard unit circle (i.e., a circle with radius 1 unit) are often used; then the domain of the other functions is the real line with some isolated points removed. Modern definitions express trigonometric functions as infinite series or as solutions of differential equations. This allows extending the domain of sine and cosine functions to the whole complex plane, and the domain of the other trigonometric functions to the complex plane with some isolated points removed.Periods
All trigonometric functions are periodic functions of period 2π. This is the smallest period, except for the tangent and the cotangent, which have π as smallest period. This means that, for every integer k, one hassin
(
x
+
2
k
π
)
=
sin
x
cos
(
x
+
2
k
π
)
=
cos
x
tan
(
x
+
k
π
)
=
tan
x
cot
(
x
+
k
π
)
=
cot
x
csc
(
x
+
2
k
π
)
=
csc
x
sec
(
x
+
2
k
π
)
=
sec
x
.
{\displaystyle {\begin{array}{lrl}\sin(x+&2k\pi )&=\sin x\\\cos(x+&2k\pi )&=\cos x\\\tan(x+&k\pi )&=\tan x\\\cot(x+&k\pi )&=\cot x\\\csc(x+&2k\pi )&=\csc x\\\sec(x+&2k\pi )&=\sec x.\end{array}}}
| 5
|
[
"Tangent (trigonometry)",
"part of",
"tangent and cotangent"
] |
Notation
Conventionally, an abbreviation of each trigonometric function's name is used as its symbol in formulas. Today, the most common versions of these abbreviations are "sin" for sine, "cos" for cosine, "tan" or "tg" for tangent, "sec" for secant, "csc" or "cosec" for cosecant, and "cot" or "ctg" for cotangent. Historically, these abbreviations were first used in prose sentences to indicate particular line segments or their lengths related to an arc of an arbitrary circle, and later to indicate ratios of lengths, but as the function concept developed in the 17th–18th century, they began to be considered as functions of real-number-valued angle measures, and written with functional notation, for example sin(x). Parentheses are still often omitted to reduce clutter, but are sometimes necessary; for example the expression
sin
x
+
y
{\displaystyle \sin x+y}
would typically be interpreted to mean
sin
(
x
)
+
y
,
{\displaystyle \sin(x)+y,}
so parentheses are required to express
sin
(
x
+
y
)
.
{\displaystyle \sin(x+y).}
A positive integer appearing as a superscript after the symbol of the function denotes exponentiation, not function composition. For example
sin
2
x
{\displaystyle \sin ^{2}x}
and
sin
2
(
x
)
{\displaystyle \sin ^{2}(x)}
denote
sin
(
x
)
⋅
sin
(
x
)
,
{\displaystyle \sin(x)\cdot \sin(x),}
not
sin
(
sin
x
)
.
{\displaystyle \sin(\sin x).}
This differs from the (historically later) general functional notation in which
f
2
(
x
)
=
(
f
∘
f
)
(
x
)
=
f
(
f
(
x
)
)
.
{\displaystyle f^{2}(x)=(f\circ f)(x)=f(f(x)).}
However, the exponent
−
1
{\displaystyle {-1}}
is commonly used to denote the inverse function, not the reciprocal. For example
sin
−
1
x
{\displaystyle \sin ^{-1}x}
and
sin
−
1
(
x
)
{\displaystyle \sin ^{-1}(x)}
denote the inverse trigonometric function alternatively written
arcsin
x
:
{\displaystyle \arcsin x\colon }
The equation
θ
=
sin
−
1
x
{\displaystyle \theta =\sin ^{-1}x}
implies
sin
θ
=
x
,
{\displaystyle \sin \theta =x,}
not
θ
⋅
sin
x
=
1.
{\displaystyle \theta \cdot \sin x=1.}
In this case, the superscript could be considered as denoting a composed or iterated function, but negative superscripts other than
−
1
{\displaystyle {-1}}
are not in common use.Etymology
The word sine derives from Latin sinus, meaning "bend; bay", and more specifically "the hanging fold of the upper part of a toga", "the bosom of a garment", which was chosen as the translation of what was interpreted as the Arabic word jaib, meaning "pocket" or "fold" in the twelfth-century translations of works by Al-Battani and al-Khwārizmī into Medieval Latin.
The choice was based on a misreading of the Arabic written form j-y-b (جيب), which itself originated as a transliteration from Sanskrit jīvā, which along with its synonym jyā (the standard Sanskrit term for the sine) translates to "bowstring", being in turn adopted from Ancient Greek χορδή "string".The word tangent comes from Latin tangens meaning "touching", since the line touches the circle of unit radius, whereas secant stems from Latin secans—"cutting"—since the line cuts the circle.The prefix "co-" (in "cosine", "cotangent", "cosecant") is found in Edmund Gunter's Canon triangulorum (1620), which defines the cosinus as an abbreviation for the sinus complementi (sine of the complementary angle) and proceeds to define the cotangens similarly.
| 8
|
[
"Trial division",
"discoverer or inventor",
"Fibonacci"
] |
Trial division is the most laborious but easiest to understand of the integer factorization algorithms. The essential idea behind trial division tests to see if an integer n, the integer to be factored, can be divided by each number in turn that is less than n. For example, for the integer n = 12, the only numbers that divide it are 1, 2, 3, 4, 6, 12. Selecting only the largest powers of primes in this list gives that 12 = 3 × 4 = 3 × 22.
Trial division was first described by Fibonacci in his book Liber Abaci (1202).
| 2
|
[
"Middle-square method",
"instance of",
"pseudorandom number generator"
] |
In mathematics and computer science, the middle-square method is a method of generating pseudorandom numbers. In practice it is a highly flawed method for many practical purposes, since its period is usually very short and it has some severe weaknesses; repeated enough times, the middle-square method will either begin repeatedly generating the same number or cycle to a previous number in the sequence and loop indefinitely.
| 4
|
[
"Tian yuan shu",
"instance of",
"algebra"
] |
Tian yuan shu (simplified Chinese: 天元术; traditional Chinese: 天元術; pinyin: tiān yuán shù) is a Chinese system of algebra for polynomial equations. Some of the earliest existing writings were created in the 13th century during the Yuan dynasty. However, the tianyuanshu method was known much earlier, in the Song dynasty and possibly before.Description
Tian yuan shu means "method of the heavenly element" or "technique of the celestial unknown". The "heavenly element" is the unknown variable, usually written x in modern notation.
It is a positional system of rod numerals to represent polynomial equations. For example, 2x2 + 18x − 316 = 0 is represented as
, which in Arabic numerals is
The 元 (yuan) denotes the unknown x, so the numerals on that line mean 18x. The line below is the constant term (-316) and the line above is the coefficient of the quadratic (x2) term. The system accommodates arbitrarily high exponents of the unknown by adding more lines on top and negative exponents by adding lines below the constant term. Decimals can also be represented.
In later writings of Li Zhi and Zhu Shijie, the line order was reversed so that the first line is the lowest exponent.
| 1
|
[
"Tian yuan shu",
"discoverer or inventor",
"Zhu Shijie"
] |
History
The Tianyuanshu was explained in the writings of Zhu Shijie (Jade Mirror of the Four Unknowns) and Li Zhi (Ceyuan haijing), two Chinese mathematicians during the Mongol Yuan dynasty.
However, after the Ming overthrew the Mongol Yuan, Zhu and Li's mathematical works went into disuse as the Ming literati became suspicious of knowledge imported from Mongol Yuan times.
Only recently, with the advent of modern mathematics in China, has the tianyuanshu been re-deciphered.
Meanwhile, tian yuan shu arrived in Japan, where it is called tengen-jutsu. Zhu's text Suanxue qimeng was deciphered and was important in the development of Japanese mathematics (wasan) in the 17th and 18th centuries.
| 5
|
[
"Verge escapement",
"subclass of",
"escapement"
] |
The verge (or crown wheel) escapement is the earliest known type of mechanical escapement, the mechanism in a mechanical clock that controls its rate by allowing the gear train to advance at regular intervals or 'ticks'. Verge escapements were used from the late 13th century until the mid 19th century in clocks and pocketwatches. The name verge comes from the Latin virga, meaning stick or rod.Its invention is important in the history of technology, because it made possible the development of all-mechanical clocks. This caused a shift from measuring time by continuous processes, such as the flow of liquid in water clocks, to repetitive, oscillatory processes, such as the swing of pendulums, which had the potential to be more accurate. Oscillating timekeepers are used in all modern timepieces.How it works
The verge escapement consists of a wheel shaped like a crown, called the escape wheel, with sawtooth-shaped teeth protruding axially toward the front, and with its axis oriented horizontally. In front of it is a vertical rod, the verge, with two metal plates, the pallets, that engage the teeth of the escape wheel at opposite sides. The pallets are not parallel, but are oriented with an angle in between them so only one catches the teeth at a time. Attached to the verge at its top is an inertial oscillator, a balance wheel or in the earliest clocks a foliot, a horizontal beam with weights on either end. This is the timekeeper of the clock.
As the clock's gears turn the crown wheel (see animation), one of its teeth catches on a pallet, pushing on it. This rotates the verge and foliot in one direction, and rotates the second pallet into the path of the teeth on the opposite side of the wheel, until the tooth slides off the end of the pallet, releasing it. Then the crown wheel rotates freely a short distance until a tooth on the wheel's opposite side contacts the second pallet, pushing on it. This reverses the direction of the verge rod and foliot, rotating the verge back the other direction, until this tooth pushes past the second pallet. Then the cycle repeats. The result is to change the rotary motion of the wheel to an oscillating motion of the verge and foliot. Each swing of the balance wheel thus allows one tooth of the escape wheel to pass, advancing the wheel train of the clock by a fixed amount, moving the hands forward at a constant rate. The moment of inertia of the foliot or balance wheel controls the oscillation rate, determining the rate of the clock. The escape wheel tooth, pushing against the pallet each swing, provides an impulse which replaces the energy lost by the foliot to friction, keeping it oscillating back and forth.
In a verge pendulum clock (see picture) which appeared after the pendulum was invented in 1656, the escapement was turned 90° so the verge rod was horizontal, while the escape wheel's axis was vertical, located under the verge rod. In the first pendulum clocks the pendulum was attached to the end of the verge rod instead of the balance wheel or foliot. In later pendulum clocks the pendulum was suspended by a short straight spring of metal ribbon from the clock frame, and a vertical arm attached to the end of the verge rod ended in a fork which embraced the pendulum rod; this avoided the friction of suspending the pendulum directly from the pivoted verge rod. Each swing of the pendulum released an escape wheel tooth.
The escape wheel must have an odd number of teeth for the escapement to function. With an even number, two opposing teeth will contact the pallets at the same time, jamming the escapement. The usual angle between the pallets was 90° to 105°, resulting in a foliot or pendulum swing of around 80° to 100°. In order to reduce the pendulum's swing to make it more isochronous, the French used larger pallet angles, upward of 115°. This reduced the pendulum swing to around 50° and reduced recoil (below), but required the verge to be located so near the crown wheel that the teeth fell on the pallets very near the axis, reducing initial leverage and increasing friction, thus requiring lighter pendulums.
| 0
|
[
"Verge escapement",
"different from",
"Foliot"
] |
The earliest description of an escapement, in Richard of Wallingford's 1327 manuscript Tractatus Horologii Astronomici on the clock he built at the Abbey of St. Albans, was not a verge, but a variation called a 'strob' escapement. It consisted of a pair of escape wheels on the same axle, with alternating radial teeth. The verge rod was suspended between them, with a short crosspiece that rotated first in one direction and then the other as the staggered teeth pushed past. Although no other example is known, it is possible that this design preceded the more usual verge in clocks.For the first two hundred years or so of the mechanical clock's existence, the verge, with foliot or balance wheel, was the only escapement used in mechanical clocks. In the sixteenth century alternative escapements started to appear, but the verge remained the most used escapement for 350 years until mid-17th century advances in mechanics, resulted in the adoption of the pendulum, and later the anchor escapement.
Since clocks were valuable, after the invention of the pendulum many verge clocks were rebuilt to use this more accurate timekeeping technology, so very few of the early verge and foliot clocks have survived unaltered to the present day.
How accurate the first verge and foliot clocks were is debatable, with estimates of one to two hours error per day being mentioned, although modern experiments with clocks of this construction show accuracies of minutes per day were achievable with enough care in design and maintenance. Early verge clocks were probably no more accurate than the previous water clocks, but they did not require water to be manually hauled to fill the reservoir, did not freeze in winter, and were a more promising technology for innovation. By the mid-17th century, when the pendulum replaced the foliot, the best verge and foliot clocks had achieved an accuracy of 15 minutes per day.
| 1
|
[
"Tenjukoku Shūchō Mandala",
"country",
"Japan"
] |
The Tenjukoku Shūchō Mandala (天寿国繍帳) is a Japanese work of textile art. It is the oldest known example of embroidery in Japan, dating back to 622 CE. It was created in honour of Prince Shōtoku, one of the earliest proponents of Japanese Buddhism.
| 0
|
[
"Tenjukoku Shūchō Mandala",
"country of origin",
"Japan"
] |
The Tenjukoku Shūchō Mandala (天寿国繍帳) is a Japanese work of textile art. It is the oldest known example of embroidery in Japan, dating back to 622 CE. It was created in honour of Prince Shōtoku, one of the earliest proponents of Japanese Buddhism.Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.
| 1
|
[
"Tenjukoku Shūchō Mandala",
"fabrication method",
"embroidery"
] |
Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.Replica and current version
The mandala is held at the Nara National Museum, but remains the property of the Chūgū-ji temple in Nara Prefecture. The extant version was created in the Edo period by combining remnants of the original embroidery with a replica made in the late 13th century.Its association with the temple and its reconstruction are due to the work of the Buddhist nun Shinnyo, who recovered the original mandala from its storage at Hōryū-ji in 1273. According to the narratives of Shinnyo's life, she had a dream in which she learned that the mandala contained the death date of the Princess Anahobe no Hashihito (穴穂部間人皇女, Anahobe no Hashihito no Himemiko), consort of Emperor Jomei and mother of Shōtoku (Shinnyo was researching Hashihito, the patroness of Chūgū-ji, as part of her work to restore the temple). The mandala was locked away at Hōryū-ji, but a break-in at the Hōryū-ji treasury allowed Shinnyo to access their stores under the pretext of checking for damages. There, she found the mandala, severely damaged, and was given permission to remove it to Chūgū-ji. She subsequently took it on a fund-raising tour to Kyoto, and received enough donations to fund the creation of a replica.Both the replica and the original were damaged by fires at Chūgū-ji in the early fourteenth century, but the damaged pieces were preserved and in the nineteenth century were combined to create the current version. The colour fastness of the original material was superior to that of the later replica; in the extant version of the artwork, the brighter sections are all derived from the original.Content
The mandala depicts the Buddhist realm of Tenjukoku (天寿国), or the "Land of Infinite Life", and presents a number of different elements representing various Buddhist concepts. The building in the bottom right is assumed by most scholars to represent the heavenly palace of Zenpōdō from the Maitreya Sutra. The main pattern of tortoises contains characters spelling the names of Shōtoku, Hashihito and Ōiratsume, arranged as a Buddhist triad, and represents Shōtoku's genealogy; other tortoises contain further characters recorded in the Jōgū Shōtoku Hōō Teisetsu, including the death dates of Shōtoku and his mother, and the story of the mandala's creation. The original version of the work contained 100 such tortoises. An inscription, purportedly a statement by Shōtoku, was originally appended: "The world is folly. Only the Buddha is real."The original base fabric on which the images are embroidered is a woven purple gauze, which may have been imported; the later replica sections are stitched onto purple twill or plain white silk. The embroidery threads of the original are z-twisted (right laid) and are sewn exclusively in backstitch while the replica uses looser s-twisted yarn and a variety of different stitches. The looser twist of the yarn may be one of the reasons that the replica sections are less well-preserved.Some researchers argue that the similarity of the mandala's iconography to Chinese and Korean funeral monuments, together with the gauze fabric on which it was originally stitched, indicate that it is not in fact a Buddhist artefact. This theory suggests that the artwork does not represent Tenjukoku, but rather constitutes a record of the memorial rites performed for Shōtoku, and that the association with Buddhism was a later development.
| 2
|
[
"Tenjukoku Shūchō Mandala",
"made from material",
"silk"
] |
Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.
| 3
|
[
"Tenjukoku Shūchō Mandala",
"time period",
"Asuka period"
] |
The Tenjukoku Shūchō Mandala (天寿国繍帳) is a Japanese work of textile art. It is the oldest known example of embroidery in Japan, dating back to 622 CE. It was created in honour of Prince Shōtoku, one of the earliest proponents of Japanese Buddhism.
| 7
|
[
"Tenjukoku Shūchō Mandala",
"commemorates",
"Prince Shōtoku"
] |
Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.
| 9
|
[
"Tenjukoku Shūchō Mandala",
"made from material",
"gauze"
] |
Content
The mandala depicts the Buddhist realm of Tenjukoku (天寿国), or the "Land of Infinite Life", and presents a number of different elements representing various Buddhist concepts. The building in the bottom right is assumed by most scholars to represent the heavenly palace of Zenpōdō from the Maitreya Sutra. The main pattern of tortoises contains characters spelling the names of Shōtoku, Hashihito and Ōiratsume, arranged as a Buddhist triad, and represents Shōtoku's genealogy; other tortoises contain further characters recorded in the Jōgū Shōtoku Hōō Teisetsu, including the death dates of Shōtoku and his mother, and the story of the mandala's creation. The original version of the work contained 100 such tortoises. An inscription, purportedly a statement by Shōtoku, was originally appended: "The world is folly. Only the Buddha is real."The original base fabric on which the images are embroidered is a woven purple gauze, which may have been imported; the later replica sections are stitched onto purple twill or plain white silk. The embroidery threads of the original are z-twisted (right laid) and are sewn exclusively in backstitch while the replica uses looser s-twisted yarn and a variety of different stitches. The looser twist of the yarn may be one of the reasons that the replica sections are less well-preserved.Some researchers argue that the similarity of the mandala's iconography to Chinese and Korean funeral monuments, together with the gauze fabric on which it was originally stitched, indicate that it is not in fact a Buddhist artefact. This theory suggests that the artwork does not represent Tenjukoku, but rather constitutes a record of the memorial rites performed for Shōtoku, and that the association with Buddhism was a later development.
| 10
|
[
"Tenjukoku Shūchō Mandala",
"owned by",
"Chūgū-ji"
] |
Replica and current version
The mandala is held at the Nara National Museum, but remains the property of the Chūgū-ji temple in Nara Prefecture. The extant version was created in the Edo period by combining remnants of the original embroidery with a replica made in the late 13th century.Its association with the temple and its reconstruction are due to the work of the Buddhist nun Shinnyo, who recovered the original mandala from its storage at Hōryū-ji in 1273. According to the narratives of Shinnyo's life, she had a dream in which she learned that the mandala contained the death date of the Princess Anahobe no Hashihito (穴穂部間人皇女, Anahobe no Hashihito no Himemiko), consort of Emperor Jomei and mother of Shōtoku (Shinnyo was researching Hashihito, the patroness of Chūgū-ji, as part of her work to restore the temple). The mandala was locked away at Hōryū-ji, but a break-in at the Hōryū-ji treasury allowed Shinnyo to access their stores under the pretext of checking for damages. There, she found the mandala, severely damaged, and was given permission to remove it to Chūgū-ji. She subsequently took it on a fund-raising tour to Kyoto, and received enough donations to fund the creation of a replica.Both the replica and the original were damaged by fires at Chūgū-ji in the early fourteenth century, but the damaged pieces were preserved and in the nineteenth century were combined to create the current version. The colour fastness of the original material was superior to that of the later replica; in the extant version of the artwork, the brighter sections are all derived from the original.
| 11
|
[
"Tenjukoku Shūchō Mandala",
"instance of",
"traditional handicraft"
] |
The Tenjukoku Shūchō Mandala (天寿国繍帳) is a Japanese work of textile art. It is the oldest known example of embroidery in Japan, dating back to 622 CE. It was created in honour of Prince Shōtoku, one of the earliest proponents of Japanese Buddhism.Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.
| 15
|
[
"Tenjukoku Shūchō Mandala",
"instance of",
"textile artwork"
] |
The Tenjukoku Shūchō Mandala (天寿国繍帳) is a Japanese work of textile art. It is the oldest known example of embroidery in Japan, dating back to 622 CE. It was created in honour of Prince Shōtoku, one of the earliest proponents of Japanese Buddhism.Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.Replica and current version
The mandala is held at the Nara National Museum, but remains the property of the Chūgū-ji temple in Nara Prefecture. The extant version was created in the Edo period by combining remnants of the original embroidery with a replica made in the late 13th century.Its association with the temple and its reconstruction are due to the work of the Buddhist nun Shinnyo, who recovered the original mandala from its storage at Hōryū-ji in 1273. According to the narratives of Shinnyo's life, she had a dream in which she learned that the mandala contained the death date of the Princess Anahobe no Hashihito (穴穂部間人皇女, Anahobe no Hashihito no Himemiko), consort of Emperor Jomei and mother of Shōtoku (Shinnyo was researching Hashihito, the patroness of Chūgū-ji, as part of her work to restore the temple). The mandala was locked away at Hōryū-ji, but a break-in at the Hōryū-ji treasury allowed Shinnyo to access their stores under the pretext of checking for damages. There, she found the mandala, severely damaged, and was given permission to remove it to Chūgū-ji. She subsequently took it on a fund-raising tour to Kyoto, and received enough donations to fund the creation of a replica.Both the replica and the original were damaged by fires at Chūgū-ji in the early fourteenth century, but the damaged pieces were preserved and in the nineteenth century were combined to create the current version. The colour fastness of the original material was superior to that of the later replica; in the extant version of the artwork, the brighter sections are all derived from the original.Content
The mandala depicts the Buddhist realm of Tenjukoku (天寿国), or the "Land of Infinite Life", and presents a number of different elements representing various Buddhist concepts. The building in the bottom right is assumed by most scholars to represent the heavenly palace of Zenpōdō from the Maitreya Sutra. The main pattern of tortoises contains characters spelling the names of Shōtoku, Hashihito and Ōiratsume, arranged as a Buddhist triad, and represents Shōtoku's genealogy; other tortoises contain further characters recorded in the Jōgū Shōtoku Hōō Teisetsu, including the death dates of Shōtoku and his mother, and the story of the mandala's creation. The original version of the work contained 100 such tortoises. An inscription, purportedly a statement by Shōtoku, was originally appended: "The world is folly. Only the Buddha is real."The original base fabric on which the images are embroidered is a woven purple gauze, which may have been imported; the later replica sections are stitched onto purple twill or plain white silk. The embroidery threads of the original are z-twisted (right laid) and are sewn exclusively in backstitch while the replica uses looser s-twisted yarn and a variety of different stitches. The looser twist of the yarn may be one of the reasons that the replica sections are less well-preserved.Some researchers argue that the similarity of the mandala's iconography to Chinese and Korean funeral monuments, together with the gauze fabric on which it was originally stitched, indicate that it is not in fact a Buddhist artefact. This theory suggests that the artwork does not represent Tenjukoku, but rather constitutes a record of the memorial rites performed for Shōtoku, and that the association with Buddhism was a later development.
| 17
|
[
"Tenjukoku Shūchō Mandala",
"instance of",
"embroidery"
] |
The Tenjukoku Shūchō Mandala (天寿国繍帳) is a Japanese work of textile art. It is the oldest known example of embroidery in Japan, dating back to 622 CE. It was created in honour of Prince Shōtoku, one of the earliest proponents of Japanese Buddhism.Creation
In the Jōgū Shōtoku Hōō Teisetsu, it is recorded that Tachibana no Ōiratsume, one of the widows of Prince Shōtoku, commissioned the mandala after her husband's death, to represent the heavenly realm to which he had departed so that she could envision his afterlife. The artwork was created by maidservants of the Imperial Court, with the permission of the Empress Suiko. The original was stitched in silk on a series of large square curtains, approximately 5 metres (16 ft) across, but only a small portion of this, measuring approximately 89 centimetres (35 in) by 83 centimetres (33 in), still survives.
| 18
|
[
"Land mine",
"part of",
"minefield"
] |
A land mine, or landmine, is an explosive device concealed under or camouflaged on the ground, and designed to destroy or disable enemy targets, ranging from combatants to vehicles and tanks, as they pass over or near it.Such a device is typically detonated automatically by way of pressure when a target steps on it or drives over it, although other detonation mechanisms are also sometimes used. A land mine may cause damage by direct blast effect, by fragments that are thrown by the blast, or by both. Landmines are typically laid throughout an area, creating a minefield which is dangerous to cross.
The use of land mines is controversial because of their potential as indiscriminate weapons. They can remain dangerous many years after a conflict has ended, harming civilians and the economy. Seventy-eight countries are contaminated with land mines and 15,000–20,000 people are killed every year while many more are injured. Approximately 80% of land mine casualties are civilians, with children as the most affected age group. Most killings occur in times of peace. With pressure from a number of campaign groups organised through the International Campaign to Ban Landmines, a global movement to prohibit their use led to the 1997 Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction, also known as the Ottawa Treaty. To date, 164 nations have signed the treaty, but these do not include China, the Russian Federation, or the United States.
| 1
|
[
"Lightning rod",
"discoverer or inventor",
"Benjamin Franklin"
] |
History
The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749, who in subsequent years developed his invention for household application (published in 1753) and made further improvements towards a reliable system around 1760.
| 1
|
[
"Lightning rod",
"has use",
"lightning protection"
] |
A lightning rod or lightning conductor (British English) is a metal rod mounted on a structure and intended to protect the structure from a lightning strike. If lightning hits the structure, it will preferentially strike the rod and be conducted to ground through a wire, instead of passing through the structure, where it could start a fire or cause electrocution. Lightning rods are also called finials, air terminals, or strike termination devices.
In a lightning protection system, a lightning rod is a single component of the system. The lightning rod requires a connection to the earth to perform its protective function. Lightning rods come in many different forms, including hollow, solid, pointed, rounded, flat strips, or even bristle brush-like. The main attribute common to all lightning rods is that they are all made of conductive materials, such as copper and aluminum. Copper and its alloys are the most common materials used in lightning protection.Structure protectors
Lightning arrester
A lightning arrester is a device, essentially an air gap between an electric wire and ground, used on electric power systems and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning. The typical lightning arrester has a high-voltage terminal and a ground terminal.
In telegraphy and telephony, a lightning arrester is a device placed where wires enter a structure, in order to prevent damage to electronic instruments within and ensuring the safety of individuals near the structures. Smaller versions of lightning arresters, also called surge protectors, are devices that are connected between each electrical conductor in a power or communications system, and the ground. They help prevent the flow of the normal power or signal currents to ground, but provide a path over which high-voltage lightning current flows, bypassing the connected equipment. Arresters are used to limit the rise in voltage when a communications or power line is struck by lightning or is near to a lightning strike.
| 7
|
[
"Arsenic",
"discoverer or inventor",
"Albertus Magnus"
] |
During the Bronze Age, arsenic was often included in bronze, which made the alloy harder (so-called "arsenical bronze").
The isolation of arsenic was described by Jabir ibn Hayyan before 815 AD. Albertus Magnus (Albert the Great, 1193–1280) later isolated the element from a compound in 1250, by heating soap together with arsenic trisulfide. In 1649, Johann Schröder published two ways of preparing arsenic. Crystals of elemental (native) arsenic are found in nature, although rare.
Cadet's fuming liquid (impure cacodyl), often claimed as the first synthetic organometallic compound, was synthesized in 1760 by Louis Claude Cadet de Gassicourt by the reaction of potassium acetate with arsenic trioxide.
| 5
|
[
"Arsenic",
"part of",
"arsenide(3-)"
] |
Compounds
Compounds of arsenic resemble in some respects those of phosphorus which occupies the same group (column) of the periodic table. The most common oxidation states for arsenic are: −3 in the arsenides, which are alloy-like intermetallic compounds, +3 in the arsenites, and +5 in the arsenates and most organoarsenic compounds. Arsenic also bonds readily to itself as seen in the square As3−4 ions in the mineral skutterudite. In the +3 oxidation state, arsenic is typically pyramidal owing to the influence of the lone pair of electrons.
| 11
|
[
"Sonnet",
"country of origin",
"Kingdom of Sicily"
] |
A sonnet is a poetic form that originated in the poetry composed at the Court of the Holy Roman Emperor Frederick II in the Sicilian city of Palermo. The 13th-century poet and notary Giacomo da Lentini is credited with the sonnet's invention, and the Sicilian School of poets who surrounded him then spread the form to the mainland. The earliest sonnets, however, no longer survive in the original Sicilian language, but only after being translated into Tuscan dialect.
The term "sonnet" is derived from the Italian word sonetto (lit. "little song", derived from the Latin word sonus, meaning a sound). By the 13th century it signified a poem of fourteen lines that followed a strict rhyme scheme and structure.
According to Christopher Blum, during the Renaissance, the sonnet became the "choice mode of expressing romantic love". During that period, too, the form was taken up in many other European language areas and eventually any subject was considered acceptable for writers of sonnets. Impatience with the set form resulted in many variations over the centuries, including abandonment of the quatorzain limit and even of rhyme altogether in modern times.
| 1
|
[
"Sonnet",
"discoverer or inventor",
"Giacomo da Lentini"
] |
A sonnet is a poetic form that originated in the poetry composed at the Court of the Holy Roman Emperor Frederick II in the Sicilian city of Palermo. The 13th-century poet and notary Giacomo da Lentini is credited with the sonnet's invention, and the Sicilian School of poets who surrounded him then spread the form to the mainland. The earliest sonnets, however, no longer survive in the original Sicilian language, but only after being translated into Tuscan dialect.
The term "sonnet" is derived from the Italian word sonetto (lit. "little song", derived from the Latin word sonus, meaning a sound). By the 13th century it signified a poem of fourteen lines that followed a strict rhyme scheme and structure.
According to Christopher Blum, during the Renaissance, the sonnet became the "choice mode of expressing romantic love". During that period, too, the form was taken up in many other European language areas and eventually any subject was considered acceptable for writers of sonnets. Impatience with the set form resulted in many variations over the centuries, including abandonment of the quatorzain limit and even of rhyme altogether in modern times.
| 8
|
[
"Sonnet",
"has part(s)",
"stanza"
] |
By the time the second half of the 19th century was reached, sonnets become chiefly interesting for their publication in long sequences. It was during this period that attempts to renew the form were continually being made. Elizabeth Barrett Browning's autobiographical Sonnets from the Portuguese (1845–50), for example, is described as the first depiction of a successful courtship since Elizabethan times. It comprises 44 sonnets of dramatised first person narrative, the enjambed lines in which frequently avoid resting at the volta. Through this means the work is distinguished by "the flexibility and control with which the verse bends to the argument and to the rhythms of thought and speech".That sequence was followed in 1862 by George Meredith's Modern Love, based in part on the breakdown of his first marriage. It employs a 16-line form, described as (and working like) a sonnet, linking together the work's fifty narrative episodes. Essentially the stanza is made up of four quatrains of enclosed rhyme, rhythmically driven forward over these divisions so as to allow a greater syntactical complexity "more readily associated with the realist novel than with lyric poetry". As other work by both the writers above demonstrates, they were capable of more straightforward fictions. In adapting the sonnet to the narrative mode, the main interest for them is in overcoming the technical challenge that they set themselves and proving the new possibilities of the form in which they are working.
Where the first quatrain in Sonnets from the Portuguese began with a reminiscence of lines from a pastoral of Theocritus, Edward Cracroft Lefroy (1855-1891) responded by reaching beyond the narrative mode towards the dramatic in the thirty adaptations from the Greek of his Echoes from Theocritus (1885, reprint 1922). Beyond this, though the idea of arranging such material in a sequence was original to Lefroy, Thomas Warwick had anticipated the approach a century before in his sonnet "From Bacchylides", equally based on a fragment of an ancient Greek author. On the other hand, Eugene Lee-Hamilton's exploration of the sonnet's dramatic possibilities was through creating historical monologues in his hundred Imaginary Sonnets (1888), based on episodes chosen from the seven centuries between 1120 – 1820. Neither sequence was anywhere the equal of those of Barrett Browning or Meredith, but they illustrate a contemporary urge to make new a form that was fast running out of steam.
| 9
|
[
"Sonnet",
"instance of",
"poetic form"
] |
A sonnet is a poetic form that originated in the poetry composed at the Court of the Holy Roman Emperor Frederick II in the Sicilian city of Palermo. The 13th-century poet and notary Giacomo da Lentini is credited with the sonnet's invention, and the Sicilian School of poets who surrounded him then spread the form to the mainland. The earliest sonnets, however, no longer survive in the original Sicilian language, but only after being translated into Tuscan dialect.
The term "sonnet" is derived from the Italian word sonetto (lit. "little song", derived from the Latin word sonus, meaning a sound). By the 13th century it signified a poem of fourteen lines that followed a strict rhyme scheme and structure.
According to Christopher Blum, during the Renaissance, the sonnet became the "choice mode of expressing romantic love". During that period, too, the form was taken up in many other European language areas and eventually any subject was considered acceptable for writers of sonnets. Impatience with the set form resulted in many variations over the centuries, including abandonment of the quatorzain limit and even of rhyme altogether in modern times.
| 13
|
[
"Selfmate",
"instance of",
"type of chess problem"
] |
A selfmate is a chess problem in which White, moving first, must force the unwilling Black to deliver checkmate within a specified number of moves. Selfmates were once known as sui-mates.Example
The problem shown is a relatively simple example. It is a selfmate in two by Wolfgang Pauly from The Theory of Pawn Promotion, 1912: White moves first and compels Black to deliver checkmate on or before Black's second move.
| 1
|
[
"Selfmate",
"subclass of",
"unorthodox chess problem"
] |
Variations
A derivative of the selfmate is the reflexmate, in which White compels Black to give mate with the added condition that if either player can give mate, they must (when this condition applies only to Black, it is a semi-reflexmate). There is also the maximummer, in which Black must always make the geometrically longest move available, as measured from square-centre to square-centre; although this condition is sometimes found in other types of problems, it is most common in selfmates. Another variation is the series-selfmate, a type of seriesmover in which White makes a series of moves without reply, at the end of which Black makes one move and is compelled to give mate.
| 2
|
[
"Grant Acedrex",
"part of",
"chess terminology"
] |
Game end
In Grant Acedrex, a player wins by either checkmating or stalemating the opponent. A player can also win by capturing all the opponent's pieces leaving him with a bare king.
| 0
|
[
"Grant Acedrex",
"country of origin",
"Crown of Castile"
] |
Grant Acedrex is a medieval chess variant dating back to the time of King Alfonso X of Castile. It appears in the Libro de los Juegos of 1283.
| 2
|
[
"Grant Acedrex",
"instance of",
"chess variant"
] |
Grant Acedrex is a medieval chess variant dating back to the time of King Alfonso X of Castile. It appears in the Libro de los Juegos of 1283.
| 3
|
[
"Nón lá",
"subclass of",
"conical Asian hat"
] |
Nón lá (Chữ Nôm: 𥶄蘿; lit. 'Leaf hat') or nón tơi (𥶄𥵖) is a type of Vietnamese headwear used to shield the face from sun and rain. Nón lá is a typical symbol of the Vietnamese people. Nón lá is a common name for many types of hats in Vietnam, but now it is mainly used to refer to cones with pointed tips.
Nón lá appeared in the 13th century, during the Trần Dynasty.
The hats have been worn since ancient times to protect the wearer from the sunshine and rain of Vietnam's tropical monsoon climate. An image of the nón lá was carved on the Ngọc Lũ bronze drum and the Đào Thịnh bronze jar around 2500–3000 BC.
In Vietnam today, there are a number of traditional hat-making villages such as Đồng Di village (Phú Vang), Dạ Lê (Hương Thủy), Trường Giang (Nông Cống), especially Phủ Cam hat village (Huế), Chuông village (Thanh Oai - Hanoi).
| 1
|
[
"Nón lá",
"made from material",
"leaf"
] |
Characteristics
Nón lá are often woven with different types of leaves such as palm leaves, let leaves, straw, bamboo, mortar leaves, hồ leaves, pandan leaves, du quy diệp leaves used to make hats, etc... but mainly made of conical leaves. Hats often have a strap made of soft fabric or velvet, silk to keep on the neck.
Cones are usually conical in shape, but there are also some types of cones that are wide and flattened. The conical leaves are arranged on a frame consisting of small bamboo slats bent into an arc, pinned with thread, or silk or monofilament. The spokes are made into thin, small and supple bamboo sticks and then bent into circles of different diameters to form cones. All are arranged next to each other on a pyramidal mold.
To make a nón lá, the craftsman takes each leaf, flattens it, then cuts the top diagonally with scissors, then uses a needle to thread about 24–35 leaves together for one turn, then arrange them evenly on the hat mold. The conical leaves are thin and also easily damaged when it rains a lot, so the craftsmen took advantage of the dry bamboo sheath to make the layer between the two layers of conical leaves, making the hat both hard and durable.
In the next stage, the craftsman takes the rope to tie the conical leaves that have been spread evenly on the mold with the hat frame and then they begin to sew. The worker puts the leaves on the side of the cone and then uses a wire and a sewing needle to make the hat into a pyramid. After forming, the hat is coated with a layer of varnish to increase durability and aesthetics (can add art decoration for hats used in art). In the middle of the 3rd and 4th spokes, the worker uses only two symmetrical pairs to tie the straps. Straps are usually made from velvet, soft silk, with many colors.
| 2
|
[
"Lanzarote",
"country",
"Spain"
] |
Lanzarote (UK: , Spanish: [lanθaˈɾote], locally [lansaˈɾote]) is a Spanish island, the easternmost of the Canary Islands in the Atlantic Ocean. It is located approximately 125 kilometres (80 miles) off the north coast of Africa and 1,000 kilometres (600 miles) from the Iberian Peninsula. Covering 845.94 square kilometres (326.62 square miles), Lanzarote is the fourth-largest of the islands in the archipelago. With 152,289 inhabitants at the start of 2019, it is the third most populous Canary Island, after Tenerife and Gran Canaria. Located in the centre-west of the island is Timanfaya National Park, one of its main attractions. The island was declared a biosphere reserve by UNESCO in 1993. The island's capital is Arrecife, which lies on the eastern coastline. It is the smaller main island of the Province of Las Palmas.
The first recorded name for the island, given by Italian-Majorcan cartographer Angelino Dulcert, was Insula de Lanzarotus Marocelus, after the Genoese navigator Lancelotto Malocello, from which the modern name is derived. The island's name in the native Guanche language was Tyterogaka or Tytheroygaka, which may mean "one that is all ochre" (referring to the island's predominant colour).
| 0
|
[
"Lanzarote",
"part of",
"Canary Islands"
] |
Lanzarote (UK: , Spanish: [lanθaˈɾote], locally [lansaˈɾote]) is a Spanish island, the easternmost of the Canary Islands in the Atlantic Ocean. It is located approximately 125 kilometres (80 miles) off the north coast of Africa and 1,000 kilometres (600 miles) from the Iberian Peninsula. Covering 845.94 square kilometres (326.62 square miles), Lanzarote is the fourth-largest of the islands in the archipelago. With 152,289 inhabitants at the start of 2019, it is the third most populous Canary Island, after Tenerife and Gran Canaria. Located in the centre-west of the island is Timanfaya National Park, one of its main attractions. The island was declared a biosphere reserve by UNESCO in 1993. The island's capital is Arrecife, which lies on the eastern coastline. It is the smaller main island of the Province of Las Palmas.
The first recorded name for the island, given by Italian-Majorcan cartographer Angelino Dulcert, was Insula de Lanzarotus Marocelus, after the Genoese navigator Lancelotto Malocello, from which the modern name is derived. The island's name in the native Guanche language was Tyterogaka or Tytheroygaka, which may mean "one that is all ochre" (referring to the island's predominant colour).
| 3
|
[
"Lanzarote",
"instance of",
"island"
] |
Lanzarote (UK: , Spanish: [lanθaˈɾote], locally [lansaˈɾote]) is a Spanish island, the easternmost of the Canary Islands in the Atlantic Ocean. It is located approximately 125 kilometres (80 miles) off the north coast of Africa and 1,000 kilometres (600 miles) from the Iberian Peninsula. Covering 845.94 square kilometres (326.62 square miles), Lanzarote is the fourth-largest of the islands in the archipelago. With 152,289 inhabitants at the start of 2019, it is the third most populous Canary Island, after Tenerife and Gran Canaria. Located in the centre-west of the island is Timanfaya National Park, one of its main attractions. The island was declared a biosphere reserve by UNESCO in 1993. The island's capital is Arrecife, which lies on the eastern coastline. It is the smaller main island of the Province of Las Palmas.
The first recorded name for the island, given by Italian-Majorcan cartographer Angelino Dulcert, was Insula de Lanzarotus Marocelus, after the Genoese navigator Lancelotto Malocello, from which the modern name is derived. The island's name in the native Guanche language was Tyterogaka or Tytheroygaka, which may mean "one that is all ochre" (referring to the island's predominant colour).Geology
Lanzarote is the northernmost and easternmost island of the Canary Islands and has a volcanic origin. The island emerged about 15 million years ago as product of the Canary hotspot. The island, along with others, emerged after the breakup of the African and the American continental plates. The greatest recorded eruptions occurred between 1730 and 1736 in the area now designated Timanfaya National Park.
| 5
|
[
"Lanzarote",
"discoverer or inventor",
"Lancelotto Malocello"
] |
Lanzarote (UK: , Spanish: [lanθaˈɾote], locally [lansaˈɾote]) is a Spanish island, the easternmost of the Canary Islands in the Atlantic Ocean. It is located approximately 125 kilometres (80 miles) off the north coast of Africa and 1,000 kilometres (600 miles) from the Iberian Peninsula. Covering 845.94 square kilometres (326.62 square miles), Lanzarote is the fourth-largest of the islands in the archipelago. With 152,289 inhabitants at the start of 2019, it is the third most populous Canary Island, after Tenerife and Gran Canaria. Located in the centre-west of the island is Timanfaya National Park, one of its main attractions. The island was declared a biosphere reserve by UNESCO in 1993. The island's capital is Arrecife, which lies on the eastern coastline. It is the smaller main island of the Province of Las Palmas.
The first recorded name for the island, given by Italian-Majorcan cartographer Angelino Dulcert, was Insula de Lanzarotus Marocelus, after the Genoese navigator Lancelotto Malocello, from which the modern name is derived. The island's name in the native Guanche language was Tyterogaka or Tytheroygaka, which may mean "one that is all ochre" (referring to the island's predominant colour).
| 8
|
[
"Lanzarote",
"named after",
"Lancelotto Malocello"
] |
Lanzarote (UK: , Spanish: [lanθaˈɾote], locally [lansaˈɾote]) is a Spanish island, the easternmost of the Canary Islands in the Atlantic Ocean. It is located approximately 125 kilometres (80 miles) off the north coast of Africa and 1,000 kilometres (600 miles) from the Iberian Peninsula. Covering 845.94 square kilometres (326.62 square miles), Lanzarote is the fourth-largest of the islands in the archipelago. With 152,289 inhabitants at the start of 2019, it is the third most populous Canary Island, after Tenerife and Gran Canaria. Located in the centre-west of the island is Timanfaya National Park, one of its main attractions. The island was declared a biosphere reserve by UNESCO in 1993. The island's capital is Arrecife, which lies on the eastern coastline. It is the smaller main island of the Province of Las Palmas.
The first recorded name for the island, given by Italian-Majorcan cartographer Angelino Dulcert, was Insula de Lanzarotus Marocelus, after the Genoese navigator Lancelotto Malocello, from which the modern name is derived. The island's name in the native Guanche language was Tyterogaka or Tytheroygaka, which may mean "one that is all ochre" (referring to the island's predominant colour).
| 9
|
[
"Cairo",
"instance of",
"capital city"
] |
Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælqɑ(ː)ˈheɾɑ]) is the capital of Egypt and the city-state Cairo Governorate, and is the country's largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metropolitan area, with a population of 21.9 million, is the 12th-largest in the world by population. Cairo is associated with ancient Egypt, as the Giza pyramid complex and the ancient cities of Memphis and Heliopolis are located in its geographical area. Located near the Nile Delta, the city first developed as Fustat, a settlement founded after the Muslim conquest of Egypt in 640 next to an existing ancient Roman fortress, Babylon. Under the Fatimid dynasty a new city, al-Qāhirah, was founded nearby in 969. It later superseded Fustat as the main urban centre during the Ayyubid and Mamluk periods (12th–16th centuries). Cairo has long been a centre of the region's political and cultural life, and is titled "the city of a thousand minarets" for its preponderance of Islamic architecture. Cairo's historic center was awarded World Heritage Site status in 1979. Cairo is considered a World City with a "Beta +" classification according to GaWC.Today, Cairo has the oldest and largest cinema and music industry in the Arab world, as well as the world's second-oldest institution of higher learning, Al-Azhar University. Many international media, businesses, and organizations have regional headquarters in the city; the Arab League has had its headquarters in Cairo for most of its existence.
With a population of over 10 million spread over 453 km2 (175 sq mi), Cairo is by far the largest city in Egypt. An additional 9.5 million inhabitants live close to the city. Cairo, like many other megacities, suffers from high levels of pollution and traffic. The Cairo Metro, opened in 1987, is the oldest metro system in Africa, and ranks amongst the fifteen busiest in the world, with over 1 billion annual passenger rides. The economy of Cairo was ranked first in the Middle East in 2005, and 43rd globally on Foreign Policy's 2010 Global Cities Index.
| 53
|
[
"Cairo",
"located in the administrative territorial entity",
"Cairo Governorate"
] |
Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælqɑ(ː)ˈheɾɑ]) is the capital of Egypt and the city-state Cairo Governorate, and is the country's largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metropolitan area, with a population of 21.9 million, is the 12th-largest in the world by population. Cairo is associated with ancient Egypt, as the Giza pyramid complex and the ancient cities of Memphis and Heliopolis are located in its geographical area. Located near the Nile Delta, the city first developed as Fustat, a settlement founded after the Muslim conquest of Egypt in 640 next to an existing ancient Roman fortress, Babylon. Under the Fatimid dynasty a new city, al-Qāhirah, was founded nearby in 969. It later superseded Fustat as the main urban centre during the Ayyubid and Mamluk periods (12th–16th centuries). Cairo has long been a centre of the region's political and cultural life, and is titled "the city of a thousand minarets" for its preponderance of Islamic architecture. Cairo's historic center was awarded World Heritage Site status in 1979. Cairo is considered a World City with a "Beta +" classification according to GaWC.Today, Cairo has the oldest and largest cinema and music industry in the Arab world, as well as the world's second-oldest institution of higher learning, Al-Azhar University. Many international media, businesses, and organizations have regional headquarters in the city; the Arab League has had its headquarters in Cairo for most of its existence.
With a population of over 10 million spread over 453 km2 (175 sq mi), Cairo is by far the largest city in Egypt. An additional 9.5 million inhabitants live close to the city. Cairo, like many other megacities, suffers from high levels of pollution and traffic. The Cairo Metro, opened in 1987, is the oldest metro system in Africa, and ranks amongst the fifteen busiest in the world, with over 1 billion annual passenger rides. The economy of Cairo was ranked first in the Middle East in 2005, and 43rd globally on Foreign Policy's 2010 Global Cities Index.
| 57
|
[
"Cairo",
"instance of",
"million city"
] |
Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælqɑ(ː)ˈheɾɑ]) is the capital of Egypt and the city-state Cairo Governorate, and is the country's largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metropolitan area, with a population of 21.9 million, is the 12th-largest in the world by population. Cairo is associated with ancient Egypt, as the Giza pyramid complex and the ancient cities of Memphis and Heliopolis are located in its geographical area. Located near the Nile Delta, the city first developed as Fustat, a settlement founded after the Muslim conquest of Egypt in 640 next to an existing ancient Roman fortress, Babylon. Under the Fatimid dynasty a new city, al-Qāhirah, was founded nearby in 969. It later superseded Fustat as the main urban centre during the Ayyubid and Mamluk periods (12th–16th centuries). Cairo has long been a centre of the region's political and cultural life, and is titled "the city of a thousand minarets" for its preponderance of Islamic architecture. Cairo's historic center was awarded World Heritage Site status in 1979. Cairo is considered a World City with a "Beta +" classification according to GaWC.Today, Cairo has the oldest and largest cinema and music industry in the Arab world, as well as the world's second-oldest institution of higher learning, Al-Azhar University. Many international media, businesses, and organizations have regional headquarters in the city; the Arab League has had its headquarters in Cairo for most of its existence.
With a population of over 10 million spread over 453 km2 (175 sq mi), Cairo is by far the largest city in Egypt. An additional 9.5 million inhabitants live close to the city. Cairo, like many other megacities, suffers from high levels of pollution and traffic. The Cairo Metro, opened in 1987, is the oldest metro system in Africa, and ranks amongst the fifteen busiest in the world, with over 1 billion annual passenger rides. The economy of Cairo was ranked first in the Middle East in 2005, and 43rd globally on Foreign Policy's 2010 Global Cities Index.
| 59
|
[
"Cairo",
"instance of",
"largest city"
] |
Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælqɑ(ː)ˈheɾɑ]) is the capital of Egypt and the city-state Cairo Governorate, and is the country's largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metropolitan area, with a population of 21.9 million, is the 12th-largest in the world by population. Cairo is associated with ancient Egypt, as the Giza pyramid complex and the ancient cities of Memphis and Heliopolis are located in its geographical area. Located near the Nile Delta, the city first developed as Fustat, a settlement founded after the Muslim conquest of Egypt in 640 next to an existing ancient Roman fortress, Babylon. Under the Fatimid dynasty a new city, al-Qāhirah, was founded nearby in 969. It later superseded Fustat as the main urban centre during the Ayyubid and Mamluk periods (12th–16th centuries). Cairo has long been a centre of the region's political and cultural life, and is titled "the city of a thousand minarets" for its preponderance of Islamic architecture. Cairo's historic center was awarded World Heritage Site status in 1979. Cairo is considered a World City with a "Beta +" classification according to GaWC.Today, Cairo has the oldest and largest cinema and music industry in the Arab world, as well as the world's second-oldest institution of higher learning, Al-Azhar University. Many international media, businesses, and organizations have regional headquarters in the city; the Arab League has had its headquarters in Cairo for most of its existence.
With a population of over 10 million spread over 453 km2 (175 sq mi), Cairo is by far the largest city in Egypt. An additional 9.5 million inhabitants live close to the city. Cairo, like many other megacities, suffers from high levels of pollution and traffic. The Cairo Metro, opened in 1987, is the oldest metro system in Africa, and ranks amongst the fifteen busiest in the world, with over 1 billion annual passenger rides. The economy of Cairo was ranked first in the Middle East in 2005, and 43rd globally on Foreign Policy's 2010 Global Cities Index.Apogee and decline under the Mamluks
In 1250, during the Seventh Crusade, the Ayyubid dynasty had a crisis with the death of al-Salih and power transitioned instead to the Mamluks, partly with the help of al-Salih's wife, Shajar ad-Durr, who ruled for a brief period around this time. Mamluks were soldiers who were purchased as young slaves and raised to serve in the sultan's army. Between 1250 and 1517 the throne of the Mamluk Sultanate passed from one mamluk to another in a system of succession that was generally non-hereditary, but also frequently violent and chaotic. The Mamluk Empire nonetheless became a major power in the region and was responsible for repelling the advance of the Mongols (most famously at the Battle of Ain Jalut in 1260) and for eliminating the last Crusader states in the Levant.Despite their military character, the Mamluks were also prolific builders and left a rich architectural legacy throughout Cairo. Continuing a practice started by the Ayyubids, much of the land occupied by former Fatimid palaces was sold and replaced by newer buildings, becoming a prestigious site for the construction of Mamluk religious and funerary complexes. Construction projects initiated by the Mamluks pushed the city outward while also bringing new infrastructure to the centre of the city. Meanwhile, Cairo flourished as a centre of Islamic scholarship and a crossroads on the spice trade route among the civilisations in Afro-Eurasia. Under the reign of the Mamluk sultan al-Nasir Muhammad (1293–1341, with interregnums), Cairo reached its apogee in terms of population and wealth. By 1340, Cairo had a population of close to half a million, making it the largest city west of China.Multi-story buildings occupied by rental apartments, known as a rab' (plural ribā' or urbu), became common in the Mamluk period and continued to be a feature of the city's housing during the later Ottoman period. These apartments were often laid out as multi-story duplexes or triplexes. They were sometimes attached to caravanserais, where the two lower floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants. The oldest partially-preserved example of this type of structure is the Wikala of Amir Qawsun, built before 1341. Residential buildings were in turn organized into close-knit neighbourhoods called a harat, which in many cases had gates that could be closed off at night or during disturbances.
| 61
|
[
"Cairo",
"instance of",
"ancient city"
] |
Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælqɑ(ː)ˈheɾɑ]) is the capital of Egypt and the city-state Cairo Governorate, and is the country's largest city, home to 10 million people. It is also part of the largest urban agglomeration in Africa, the Arab world and the Middle East: The Greater Cairo metropolitan area, with a population of 21.9 million, is the 12th-largest in the world by population. Cairo is associated with ancient Egypt, as the Giza pyramid complex and the ancient cities of Memphis and Heliopolis are located in its geographical area. Located near the Nile Delta, the city first developed as Fustat, a settlement founded after the Muslim conquest of Egypt in 640 next to an existing ancient Roman fortress, Babylon. Under the Fatimid dynasty a new city, al-Qāhirah, was founded nearby in 969. It later superseded Fustat as the main urban centre during the Ayyubid and Mamluk periods (12th–16th centuries). Cairo has long been a centre of the region's political and cultural life, and is titled "the city of a thousand minarets" for its preponderance of Islamic architecture. Cairo's historic center was awarded World Heritage Site status in 1979. Cairo is considered a World City with a "Beta +" classification according to GaWC.Today, Cairo has the oldest and largest cinema and music industry in the Arab world, as well as the world's second-oldest institution of higher learning, Al-Azhar University. Many international media, businesses, and organizations have regional headquarters in the city; the Arab League has had its headquarters in Cairo for most of its existence.
With a population of over 10 million spread over 453 km2 (175 sq mi), Cairo is by far the largest city in Egypt. An additional 9.5 million inhabitants live close to the city. Cairo, like many other megacities, suffers from high levels of pollution and traffic. The Cairo Metro, opened in 1987, is the oldest metro system in Africa, and ranks amongst the fifteen busiest in the world, with over 1 billion annual passenger rides. The economy of Cairo was ranked first in the Middle East in 2005, and 43rd globally on Foreign Policy's 2010 Global Cities Index.History
Ancient settlements
The area around present-day Cairo had long been a focal point of Ancient Egypt due to its strategic location at the junction of the Nile Valley and the Nile Delta regions (roughly Upper Egypt and Lower Egypt), which also placed it at the crossing of major routes between North Africa and the Levant. Memphis, the capital of Egypt during the Old Kingdom and a major city up until the Ptolemaic period, was located a short distance south west of present-day Cairo. Heliopolis, another important city and major religious center, was located in what are now the northeastern late 20th Century Matariya district of Cairo. It was largely destroyed by the Persian invasions in 525 BC and 343 BC and partly abandoned by the late first century BC.However, the origins of modern Cairo are generally traced back to a series of settlements in the first millennium AD. Around the turn of the fourth century, as Memphis was continuing to decline in importance, the Romans established a large fortress along the east bank of the Nile. The fortress, called Babylon, was built by the Roman emperor Diocletian (r. 285–305) at the entrance of a canal connecting the Nile to the Red Sea that was created earlier by emperor Trajan (r. 98–115). Further north of the fortress, near the present-day district of al-Azbakiya, was a port and fortified outpost known as Tendunyas (Coptic: ϯⲁⲛⲧⲱⲛⲓⲁⲥ) or Umm Dunayn. While no structures older than the 7th century have been preserved in the area aside from the Roman fortifications, historical evidence suggests that a sizeable city existed. The city was important enough that its bishop, Cyrus, participated in the Second Council of Ephesus in 449.The Byzantine-Sassanian War between 602 and 628 caused great hardship and likely caused much of the urban population to leave for the countryside, leaving the settlement partly deserted. The site today remains at the nucleus of the Coptic Orthodox community, which separated from the Roman and Byzantine churches in the late 4th century. Cairo's oldest extant churches, such as the Church of Saint Barbara and the Church of Saints Sergius and Bacchus (from the late 7th or early 8th century), are located inside the fortress walls in what is now known as Old Cairo or Coptic Cairo.
| 65
|
[
"Alexandria",
"country",
"Egypt"
] |
The Royal Palaces, filling the northeast angle of the town and occupying the promontory of Lochias, which shut in the Great Harbour on the east. Lochias (the modern Pharillon) has almost entirely disappeared into the sea, together with the palaces, the "Private Port," and the island of Antirrhodus. There has been a land subsidence here, as throughout the northeast coast of Africa.
The Great Theater, on the modern Hospital Hill near the Ramleh station. This was used by Julius Caesar as a fortress, where he withstood a siege from the city mob after he took Egypt after the battle of Pharsalus.
The Poseidon, or Temple of the Sea God, close to the theater
The Timonium built by Marc Antony
The Emporium (Exchange)
The Apostases (Magazines)
The Navalia (Docks), lying west of the Timonium, along the seafront as far as the mole
Behind the Emporium rose the Great Caesareum, by which stood the two great obelisks, which become known as "Cleopatra's Needles," and were transported to New York City and London. This temple became, in time, the Patriarchal Church, though some ancient remains of the temple have been discovered. The actual Caesareum, the parts not eroded by the waves, lies under the houses lining the new seawall.
The Gymnasium and the Palaestra are both inland, near the Boulevard de Rosette in the eastern half of the town; sites unknown.
The Temple of Saturn; site unknown.
The Mausolea of Alexander (Soma) and the Ptolemies in one ring-fence, near the point of intersection of the two main streets.
The Musaeum with its famous Library and theater in the same region; site unknown.
The Serapeum of Alexandria, the most famous of all Alexandrian temples. Strabo tells that this stood in the west of the city; and recent discoveries go far as to place it near "Pompey's Pillar," which was an independent monument erected to commemorate Diocletian's siege of the city.The names of a few other public buildings on the mainland are known, but there is little information as to their actual position. None, however, are as famous as the building that stood on the eastern point of Pharos island. There, The Great Lighthouse, one of the Seven Wonders of the World, reputed to be 138 m (453 ft) high, was situated. The first Ptolemy began the project, and the second Ptolemy (Ptolemy II Philadelphus) completed it, at a total cost of 800 talents. It took 12 years to complete and served as a prototype for all later lighthouses in the world. The light was produced by a furnace at the top and the tower was built mostly with solid blocks of limestone. The Pharos lighthouse was destroyed by an earthquake in the 14th century, making it the second longest surviving ancient wonder, after the Great Pyramid of Giza. A temple of Hephaestus also stood on Pharos at the head of the mole.
In the 1st century, the population of Alexandria contained over 180,000 adult male citizens, according to a census dated from 32 AD, in addition to a large number of freedmen, women, children and slaves. Estimates of the total population range from 216,000 to 500,000, making it one of the largest cities ever built before the Industrial Revolution and the largest pre-industrial city that was not an imperial capital.Geography
Alexandria is located in the country of Egypt, on the southern coast of the Mediterranean. It is in the Far West Nile delta area. Its a densely populated city, its core areas belie its large administrative area.Notes:2020 CAPMAS projection based on 2017 revised census figures, may differ significantly from 2017 census preliminary tabulations. The 14 kisms were reported simply as Alexandria city by CAPMAS in 2006 but given explosive growth definitions, likely informal, may have change or may be set to change. Same area with 12 kisms existed in 1996. Kisms are considered 'fully urbanized'
| 6
|
[
"Alexandria",
"located in/on physical feature",
"Nile Delta"
] |
Geography
Alexandria is located in the country of Egypt, on the southern coast of the Mediterranean. It is in the Far West Nile delta area. Its a densely populated city, its core areas belie its large administrative area.Notes:2020 CAPMAS projection based on 2017 revised census figures, may differ significantly from 2017 census preliminary tabulations. The 14 kisms were reported simply as Alexandria city by CAPMAS in 2006 but given explosive growth definitions, likely informal, may have change or may be set to change. Same area with 12 kisms existed in 1996. Kisms are considered 'fully urbanized'
| 50
|
[
"Alexandria",
"instance of",
"big city"
] |
Geography
Alexandria is located in the country of Egypt, on the southern coast of the Mediterranean. It is in the Far West Nile delta area. Its a densely populated city, its core areas belie its large administrative area.Notes:2020 CAPMAS projection based on 2017 revised census figures, may differ significantly from 2017 census preliminary tabulations. The 14 kisms were reported simply as Alexandria city by CAPMAS in 2006 but given explosive growth definitions, likely informal, may have change or may be set to change. Same area with 12 kisms existed in 1996. Kisms are considered 'fully urbanized'
| 57
|
[
"Alexandria",
"located in the administrative territorial entity",
"Alexandria Governorate"
] |
Geography
Alexandria is located in the country of Egypt, on the southern coast of the Mediterranean. It is in the Far West Nile delta area. Its a densely populated city, its core areas belie its large administrative area.Notes:2020 CAPMAS projection based on 2017 revised census figures, may differ significantly from 2017 census preliminary tabulations. The 14 kisms were reported simply as Alexandria city by CAPMAS in 2006 but given explosive growth definitions, likely informal, may have change or may be set to change. Same area with 12 kisms existed in 1996. Kisms are considered 'fully urbanized'
| 58
|
[
"Kenya",
"country",
"Kenya"
] |
Kenya, officially the Republic of Kenya (Swahili: Jamhuri ya Kenya), is a country in East Africa. With a population of more than 47.6 million in the 2019 census, Kenya is the 27th most populous country in the world and 7th most populous in Africa. Kenya's capital and largest city is Nairobi, while its oldest, currently second largest city, and first capital is the coastal city of Mombasa. Kisumu City is the third-largest city and also an inland port on Lake Victoria. As of 2020, Kenya is the third-largest economy in sub-Saharan Africa after Nigeria and South Africa. Kenya is bordered by South Sudan to the northwest, Ethiopia to the north, Somalia to the east, Uganda to the west, Tanzania to the south, and the Indian Ocean to the southeast. Its geography, climate and population vary widely, ranging from cold snow-capped mountaintops (Batian, Nelion and Point Lenana on Mount Kenya) with vast surrounding forests, wildlife and fertile agricultural regions to temperate climates in western and rift valley counties and dry less fertile arid and semi-arid areas and absolute deserts (Chalbi Desert and Nyiri Desert).
Kenya's earliest inhabitants were hunter-gatherers, like the present-day Hadza people. According to archaeological dating of associated artifacts and skeletal material, Cushitic speakers first settled in Kenya's lowlands between 3,200 and 1,300 BC, a phase known as the Lowland Savanna Pastoral Neolithic. Nilotic-speaking pastoralists (ancestral to Kenya's Nilotic speakers) began migrating from present-day South Sudan into Kenya around 500 BC. Bantu people settled at the coast and the interior between 250 BC and 500 AD. European contact began in 1500 AD with the Portuguese Empire, and effective colonisation of Kenya began in the 19th century during the European exploration of the interior. Modern-day Kenya emerged from a protectorate established by the British Empire in 1895 and the subsequent Kenya Colony, which began in 1920. Numerous disputes between the UK and the colony led to the Mau Mau revolution, which began in 1952, and the declaration of independence in 1963. After independence, Kenya remained a member of the Commonwealth of Nations. The current constitution was adopted in 2010 and replaced the 1963 independence constitution.
Kenya is a presidential representative democratic republic, in which elected officials represent the people and the president is the head of state and government. Kenya is a member of the United Nations, Commonwealth of Nations, World Bank, International Monetary Fund, COMESA, International Criminal Court, as well as other international organisations. With a GNI of 1,840, Kenya is a lower-middle-income economy. Kenya's economy is the largest in eastern and central Africa, with Nairobi serving as a major regional commercial hub. Agriculture is the largest sector: tea and coffee are traditional cash crops, while fresh flowers are a fast-growing export. The service industry is also a major economic driver, particularly tourism. Kenya is a member of the East African Community trade bloc, though some international trade organisations categorise it as part of the Greater Horn of Africa. Africa is Kenya's largest export market, followed by the European Union.
| 8
|
[
"Kenya",
"shares border with",
"Somalia"
] |
The deal allowed for China's state-controlled offshore oil and gas company, CNOOC, to prospect for oil in Kenya, which is just beginning to drill its first exploratory wells on the borders of Sudan and the disputed area of North Eastern Province, on the border with Somalia and in coastal waters. There are formal estimates of the possible reserves of oil discovered.
| 21
|
[
"Kenya",
"shares border with",
"Tanzania"
] |
Wildlife
Kenya has considerable land area devoted to wildlife habitats, including the Masai Mara, where blue wildebeest and other bovids participate in a large-scale annual migration. More than one million wildebeest and 200,000 zebras participate in the migration across the Mara River.The "Big Five" game animals of Africa, that is the lion, leopard, buffalo, rhinoceros, and elephant, can be found in Kenya and in the Masai Mara in particular. A significant population of other wild animals, reptiles, and birds can be found in the national parks and game reserves in the country. The annual animal migration occurs between June and September, with millions of animals taking part, attracting valuable foreign tourism. Two million wildebeest migrate a distance of 2,900 kilometres (1,802 mi) from the Serengeti in neighbouring Tanzania to the Masai Mara in Kenya, in a constant clockwise fashion, searching for food and water supplies. This Serengeti Migration of the wildebeest is listed among the Seven Natural Wonders of Africa.Kenya had a 2019 Forest Landscape Integrity Index mean score of 4.2/10, ranking it 133rd globally out of 172 countries.
| 39
|
[
"Kenya",
"instance of",
"country"
] |
Kenya, officially the Republic of Kenya (Swahili: Jamhuri ya Kenya), is a country in East Africa. With a population of more than 47.6 million in the 2019 census, Kenya is the 27th most populous country in the world and 7th most populous in Africa. Kenya's capital and largest city is Nairobi, while its oldest, currently second largest city, and first capital is the coastal city of Mombasa. Kisumu City is the third-largest city and also an inland port on Lake Victoria. As of 2020, Kenya is the third-largest economy in sub-Saharan Africa after Nigeria and South Africa. Kenya is bordered by South Sudan to the northwest, Ethiopia to the north, Somalia to the east, Uganda to the west, Tanzania to the south, and the Indian Ocean to the southeast. Its geography, climate and population vary widely, ranging from cold snow-capped mountaintops (Batian, Nelion and Point Lenana on Mount Kenya) with vast surrounding forests, wildlife and fertile agricultural regions to temperate climates in western and rift valley counties and dry less fertile arid and semi-arid areas and absolute deserts (Chalbi Desert and Nyiri Desert).
Kenya's earliest inhabitants were hunter-gatherers, like the present-day Hadza people. According to archaeological dating of associated artifacts and skeletal material, Cushitic speakers first settled in Kenya's lowlands between 3,200 and 1,300 BC, a phase known as the Lowland Savanna Pastoral Neolithic. Nilotic-speaking pastoralists (ancestral to Kenya's Nilotic speakers) began migrating from present-day South Sudan into Kenya around 500 BC. Bantu people settled at the coast and the interior between 250 BC and 500 AD. European contact began in 1500 AD with the Portuguese Empire, and effective colonisation of Kenya began in the 19th century during the European exploration of the interior. Modern-day Kenya emerged from a protectorate established by the British Empire in 1895 and the subsequent Kenya Colony, which began in 1920. Numerous disputes between the UK and the colony led to the Mau Mau revolution, which began in 1952, and the declaration of independence in 1963. After independence, Kenya remained a member of the Commonwealth of Nations. The current constitution was adopted in 2010 and replaced the 1963 independence constitution.
Kenya is a presidential representative democratic republic, in which elected officials represent the people and the president is the head of state and government. Kenya is a member of the United Nations, Commonwealth of Nations, World Bank, International Monetary Fund, COMESA, International Criminal Court, as well as other international organisations. With a GNI of 1,840, Kenya is a lower-middle-income economy. Kenya's economy is the largest in eastern and central Africa, with Nairobi serving as a major regional commercial hub. Agriculture is the largest sector: tea and coffee are traditional cash crops, while fresh flowers are a fast-growing export. The service industry is also a major economic driver, particularly tourism. Kenya is a member of the East African Community trade bloc, though some international trade organisations categorise it as part of the Greater Horn of Africa. Africa is Kenya's largest export market, followed by the European Union.
| 83
|
[
"Kenya",
"shares border with",
"Sudan"
] |
Kenya, officially the Republic of Kenya (Swahili: Jamhuri ya Kenya), is a country in East Africa. With a population of more than 47.6 million in the 2019 census, Kenya is the 27th most populous country in the world and 7th most populous in Africa. Kenya's capital and largest city is Nairobi, while its oldest, currently second largest city, and first capital is the coastal city of Mombasa. Kisumu City is the third-largest city and also an inland port on Lake Victoria. As of 2020, Kenya is the third-largest economy in sub-Saharan Africa after Nigeria and South Africa. Kenya is bordered by South Sudan to the northwest, Ethiopia to the north, Somalia to the east, Uganda to the west, Tanzania to the south, and the Indian Ocean to the southeast. Its geography, climate and population vary widely, ranging from cold snow-capped mountaintops (Batian, Nelion and Point Lenana on Mount Kenya) with vast surrounding forests, wildlife and fertile agricultural regions to temperate climates in western and rift valley counties and dry less fertile arid and semi-arid areas and absolute deserts (Chalbi Desert and Nyiri Desert).
Kenya's earliest inhabitants were hunter-gatherers, like the present-day Hadza people. According to archaeological dating of associated artifacts and skeletal material, Cushitic speakers first settled in Kenya's lowlands between 3,200 and 1,300 BC, a phase known as the Lowland Savanna Pastoral Neolithic. Nilotic-speaking pastoralists (ancestral to Kenya's Nilotic speakers) began migrating from present-day South Sudan into Kenya around 500 BC. Bantu people settled at the coast and the interior between 250 BC and 500 AD. European contact began in 1500 AD with the Portuguese Empire, and effective colonisation of Kenya began in the 19th century during the European exploration of the interior. Modern-day Kenya emerged from a protectorate established by the British Empire in 1895 and the subsequent Kenya Colony, which began in 1920. Numerous disputes between the UK and the colony led to the Mau Mau revolution, which began in 1952, and the declaration of independence in 1963. After independence, Kenya remained a member of the Commonwealth of Nations. The current constitution was adopted in 2010 and replaced the 1963 independence constitution.
Kenya is a presidential representative democratic republic, in which elected officials represent the people and the president is the head of state and government. Kenya is a member of the United Nations, Commonwealth of Nations, World Bank, International Monetary Fund, COMESA, International Criminal Court, as well as other international organisations. With a GNI of 1,840, Kenya is a lower-middle-income economy. Kenya's economy is the largest in eastern and central Africa, with Nairobi serving as a major regional commercial hub. Agriculture is the largest sector: tea and coffee are traditional cash crops, while fresh flowers are a fast-growing export. The service industry is also a major economic driver, particularly tourism. Kenya is a member of the East African Community trade bloc, though some international trade organisations categorise it as part of the Greater Horn of Africa. Africa is Kenya's largest export market, followed by the European Union.The deal allowed for China's state-controlled offshore oil and gas company, CNOOC, to prospect for oil in Kenya, which is just beginning to drill its first exploratory wells on the borders of Sudan and the disputed area of North Eastern Province, on the border with Somalia and in coastal waters. There are formal estimates of the possible reserves of oil discovered.
| 93
|
[
"Kenya",
"named after",
"Mount Kenya"
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Etymology
The Republic of Kenya is named after Mount Kenya. The earliest recorded version of the modern name was written by German explorer Johann Ludwig Krapf in the 19th century. While travelling with a Kamba caravan led by the legendary long-distance trader Chief Kivoi, Krapf spotted the mountain peak and asked what it was called. Kivoi told him "Kĩ-Nyaa" or "Kĩĩma- Kĩĩnyaa", probably because the pattern of black rock and white snow on its peaks reminded him of the feathers of the male ostrich. In archaic Kikuyu the word 'nyaga' or more commonly 'manyaganyaga' is used to describe an extremely bright object. The Agikuyu, who inhabit the slopes of Mt. Kenya, call it Kĩrĩma Kĩrĩnyaga (literally 'the mountain with brightness') in Kikuyu, while the Embu call it "Kirenyaa". All three names have the same meaning.Ludwig Krapf recorded the name as both Kenia and Kegnia. Some have said that this was a precise notation of the African pronunciation . An 1882 map drawn by Joseph Thompsons, a Scottish geologist and naturalist, indicated Mt. Kenya as Mt. Kenia. The mountain's name was accepted, pars pro toto, as the name of the country. It did not come into widespread official use during the early colonial period, when the country was referred to as the East African Protectorate. The official name was changed to the Colony of Kenya in 1920.
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