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module-seasons.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Module: seasons</title>
<script src="scripts/prettify/prettify.js"> </script>
<script src="scripts/prettify/lang-css.js"> </script>
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<body>
<div id="main">
<h1 class="page-title">Module: seasons</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="description">Dates of tropical events for a given Milesian year.
These functions implement Jean Meeus' method for computing tropical events.
The code derives from Fourmilab's astro.js file (2015).
Code has been modified in order to conform with strict mode.</div>
<dl class="details">
<dt class="tag-version">Version:</dt>
<dd class="tag-version"><ul class="dummy"><li>M2022-11-04</li></ul></dd>
<dt class="tag-author">Author:</dt>
<dd class="tag-author">
<ul>
<li>Louis A. de Fouquières https://github.com/Louis-Aime</li>
</ul>
</dd>
<dt class="tag-license">License:</dt>
<dd class="tag-license"><ul class="dummy"><li>MIT 2016-2022</li></ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="seasons.js.html">seasons.js</a>, <a href="seasons.js.html#line1">line 1</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Requires</h3>
<ul>
<li>module:getdeltat</li>
</ul>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id=".equinox"><span class="type-signature">(static) </span>equinox<span class="signature">(year, which)</span><span class="type-signature"> → {number}</span></h4>
<div class="description">
The Julian Day of a tropical event (equinox or solstice) of a given year.This function implements Jean Meeus' method for calculating equinox and solstices dates of a given year.This implementation is extracted from Fourmilab's astro functions (John Walker, http://www.fourmilab.ch/, September MIM).
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>year</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last">the Gregorian year.</td>
</tr>
<tr>
<td class="name"><code>which</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last">0->March, 1->June, 2->September, 3->December, any other value -> Error.</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="seasons.js.html">seasons.js</a>, <a href="seasons.js.html#line78">line 78</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
the date of the event in Julian Day, Terrestrial Time.
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">number</span>
</dd>
</dl>
<h4 class="name" id=".tropicEvent"><span class="type-signature">(static) </span>tropicEvent<span class="signature">(year, which)</span><span class="type-signature"> → {Date}</span></h4>
<div class="description">
Compute a tropical event of a Milesian year, result as a Date.Milesian year means the year beginning at a northern winter solstice and finishing at the next northern winter solstice.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>year</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last">the Milesian year</td>
</tr>
<tr>
<td class="name"><code>which</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="description last">the season, coded as:
0->Winter solstice at beginning of year,
1->Spring equinox,
2->Summer solstice,
3->Autumn equinox,
4->Winter solstice at end of year,
any other value -> Error.</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="seasons.js.html">seasons.js</a>, <a href="seasons.js.html#line164">line 164</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
the date of the event (correction with an estimate of Delta T).
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Date</span>
</dd>
</dl>
</article>
</section>
</div>
<nav>
<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-calendarclock.html">calendarclock</a></li><li><a href="module-countconversion.html">countconversion</a></li><li><a href="module-deltat.html">deltat</a></li><li><a href="module-lunar.html">lunar</a></li><li><a href="module-seasons.html">seasons</a></li><li><a href="module-yearsignature.html">yearsignature</a></li></ul><h3>Classes</h3><ul><li><a href="module-calendarclock.SolarClock.html">SolarClock</a></li><li><a href="module-countconversion.ExtCountDate.html">ExtCountDate</a></li><li><a href="timeShift.html">timeShift</a></li></ul><h3>Interfaces</h3><ul><li><a href="clockAnimate.html">clockAnimate</a></li><li><a href="myTimeShift.html">myTimeShift</a></li></ul><h3>Global</h3><ul><li><a href="global.html#calcCustomDate">calcCustomDate</a></li><li><a href="global.html#calcJulianDay">calcJulianDay</a></li><li><a href="global.html#calcTime">calcTime</a></li><li><a href="global.html#calcWeek">calcWeek</a></li><li><a href="global.html#setDateToNow">setDateToNow</a></li><li><a href="global.html#setDateToToday">setDateToToday</a></li><li><a href="global.html#setUTCHoursFixed">setUTCHoursFixed</a></li><li><a href="global.html#undef">undef</a></li></ul>
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