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<div class="PageDoc"><div class="header">
  <div class="headertitle">
<div class="title">practical-astronomy-python </div>  </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><p><a class="anchor" id="md__home_jimc_projects_Practical_Astronomy_practical_astronomy_python_venv_practical_astronomy_python_README"></a> Algorithms from <a href="https://www.amazon.com/Practical-Astronomy-your-Calculator-Spreadsheet/dp/1108436072">Practical Astronomy with your Calculator or Spreadsheet</a> by Peter Duffett-Smith, implemented in Python 3. API documentation is published <a href="https://jfcarr.github.io/practical-astronomy-python/">here</a>.</p>
<p>If you're interested in this topic, please buy the book! It provides far more detail and context.</p>
<h1><a class="anchor" id="autotoc_md133"></a>
Quick Start</h1>
<p>Install:</p>
<div class="fragment"><div class="line">pip install practical-astronomy</div>
</div><!-- fragment --><p>Create <code>easter.py</code>:</p>
<div class="fragment"><div class="line">import practical_astronomy.pa_datetime as pd</div>
<div class="line"> </div>
<div class="line">print(pd.get_date_of_easter(2024))</div>
</div><!-- fragment --><p>Run it:</p>
<div class="fragment"><div class="line">python easter.py</div>
</div><!-- fragment --><p>Result:</p>
<div class="fragment"><div class="line">(3, 31, 2024)</div>
</div><!-- fragment --><h1><a class="anchor" id="autotoc_md134"></a>
Unit Tests</h1>
<p>If you clone the <a href="https://github.com/jfcarr/practical-astronomy-python">repo</a> locally, you can run unit tests with the Make utility:</p>
<div class="fragment"><div class="line">make all-tests</div>
</div><!-- fragment --><h1><a class="anchor" id="autotoc_md135"></a>
Library Functions</h1>
<p>Documentation <a href="https://jfcarr.github.io/practical-astronomy-python/">here</a>.</p>
<h2><a class="anchor" id="autotoc_md136"></a>
Date/Time</h2>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">Type   </th><th class="markdownTableHeadNone">Description    </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Date of Easter    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Civil Date to Day Number    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Greenwich Date &lt;-&gt; Julian Date    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Julian Date to Day-of-Week    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Extract   </td><td class="markdownTableBodyNone">Day, Month, and Year parts of Julian Date    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Civil Time &lt;-&gt; Decimal Hours    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Extract   </td><td class="markdownTableBodyNone">Hour, Minutes, and Seconds parts of Decimal Hours    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Local Civil Time &lt;-&gt; Universal Time    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Universal Time &lt;-&gt; Greenwich Sidereal Time    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Greenwich Sidereal Time &lt;-&gt; Local Sidereal Time   </td></tr>
</table>
<h2><a class="anchor" id="autotoc_md137"></a>
Coordinates</h2>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">Type   </th><th class="markdownTableHeadNone">Description    </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Angle &lt;-&gt; Decimal Degrees    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Right Ascension &lt;-&gt; Hour Angle    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Equatorial Coordinates &lt;-&gt; Horizon Coordinates    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Obliquity of the Ecliptic    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Ecliptic Coordinates &lt;-&gt; Equatorial Coordinates    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Convert   </td><td class="markdownTableBodyNone">Equatorial Coordinates &lt;-&gt; Galactic Coordinates    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Angle between two objects    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Rising and Setting times for an object    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Precession (corrected coordinates between two epochs)    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Nutation (in ecliptic longitude and obliquity) for a Greenwich date    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Effects of aberration for ecliptic coordinates    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">RA and Declination values, corrected for atmospheric refraction and geocentric parallax    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Heliographic coordinates    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Carrington rotation number    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Selenographic (lunar) coordinates (sub-Earth and sub-Solar)   </td></tr>
</table>
<h2><a class="anchor" id="autotoc_md138"></a>
The Sun</h2>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">Type   </th><th class="markdownTableHeadNone">Description    </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Approximate and precise positions of the Sun    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Sun's distance and angular size    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Local sunrise and sunset    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Morning and evening twilight    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Equation of time    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Solar elongation   </td></tr>
</table>
<h2><a class="anchor" id="autotoc_md139"></a>
Planets</h2>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">Type   </th><th class="markdownTableHeadNone">Description    </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Approximate and precise position of planet    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Visual aspects of planet (distance, angular diameter, phase, light time, position angle of bright limb, and apparent magnitude)    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Position of comet (elliptical and parabolic)    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Binary star orbit data   </td></tr>
</table>
<h2><a class="anchor" id="autotoc_md140"></a>
The Moon</h2>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">Type   </th><th class="markdownTableHeadNone">Description    </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Approximate and precise position of Moon    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Moon phase and position angle of bright limb    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Times of new Moon and full Moon    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Moon's distance, angular diameter, and horizontal parallax    </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Local moonrise and moonset   </td></tr>
</table>
<h2><a class="anchor" id="autotoc_md141"></a>
Eclipses</h2>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">Type   </th><th class="markdownTableHeadNone">Description    </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Lunar eclipse occurrence and circumstances    </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone">Calculate   </td><td class="markdownTableBodyNone">Solar eclipse occurrence and circumstances   </td></tr>
</table>
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