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84f2155 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | # practical-astronomy-python
Algorithms from [Practical Astronomy with your Calculator or Spreadsheet](https://www.amazon.com/Practical-Astronomy-your-Calculator-Spreadsheet/dp/1108436072) by Peter Duffett-Smith, implemented in Python 3. API documentation is published [here](https://jfcarr.github.io/practical-astronomy-python/).
If you're interested in this topic, please buy the book! It provides far more detail and context.
## Quick Start
Install:
```bash
pip install practical-astronomy
```
Create `easter.py`:
```python
import practical_astronomy.pa_datetime as pd
print(pd.get_date_of_easter(2024))
```
Run it:
```bash
python easter.py
```
Result:
```
(3, 31, 2024)
```
## Unit Tests
If you clone the [repo](https://github.com/jfcarr/practical-astronomy-python) locally, you can run unit tests with the Make utility:
```
make all-tests
```
## Library Functions
Documentation [here](https://jfcarr.github.io/practical-astronomy-python/).
### Date/Time
Type | Description
-----|------------
Calculate | Date of Easter
Convert | Civil Date to Day Number
Convert | Greenwich Date <-> Julian Date
Convert | Julian Date to Day-of-Week
Extract | Day, Month, and Year parts of Julian Date
Convert | Civil Time <-> Decimal Hours
Extract | Hour, Minutes, and Seconds parts of Decimal Hours
Convert | Local Civil Time <-> Universal Time
Convert | Universal Time <-> Greenwich Sidereal Time
Convert | Greenwich Sidereal Time <-> Local Sidereal Time
### Coordinates
Type | Description
-----|------------
Convert | Angle <-> Decimal Degrees
Convert | Right Ascension <-> Hour Angle
Convert | Equatorial Coordinates <-> Horizon Coordinates
Calculate | Obliquity of the Ecliptic
Convert | Ecliptic Coordinates <-> Equatorial Coordinates
Convert | Equatorial Coordinates <-> Galactic Coordinates
Calculate | Angle between two objects
Calculate | Rising and Setting times for an object
Calculate | Precession (corrected coordinates between two epochs)
Calculate | Nutation (in ecliptic longitude and obliquity) for a Greenwich date
Calculate | Effects of aberration for ecliptic coordinates
Calculate | RA and Declination values, corrected for atmospheric refraction and geocentric parallax
Calculate | Heliographic coordinates
Calculate | Carrington rotation number
Calculate | Selenographic (lunar) coordinates (sub-Earth and sub-Solar)
### The Sun
Type | Description
-----|------------
Calculate | Approximate and precise positions of the Sun
Calculate | Sun's distance and angular size
Calculate | Local sunrise and sunset
Calculate | Morning and evening twilight
Calculate | Equation of time
Calculate | Solar elongation
### Planets
Type | Description
-----|------------
Calculate | Approximate and precise position of planet
Calculate | Visual aspects of planet (distance, angular diameter, phase, light time, position angle of bright limb, and apparent magnitude)
Calculate | Position of comet (elliptical and parabolic)
Calculate | Binary star orbit data
### The Moon
Type | Description
-----|------------
Calculate | Approximate and precise position of Moon
Calculate | Moon phase and position angle of bright limb
Calculate | Times of new Moon and full Moon
Calculate | Moon's distance, angular diameter, and horizontal parallax
Calculate | Local moonrise and moonset
### Eclipses
Type | Description
-----|------------
Calculate | Lunar eclipse occurrence and circumstances
Calculate | Solar eclipse occurrence and circumstances
|