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module-deltat.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Module: deltat</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: deltat</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="description">Computation of an estimate of Delta_T, for astronomical computations with calendars.
Delta_T is defined in this way: UTC = TT - Delta_T, where UTC (formerly GMT) is the master time of all our clocks.
TT is Terrestrial Time, a uniform time scale defined independently from any Earth movements.
Delta_T is erratic and difficult to compute, however, the general trend of Delta_T is due to the braking of the Earth's daily revolution.
This estimate of Deltta_T in seconds from the year expressed in Common Era is a quadratic function of the year.
The computation of the long-term Delta_T is after Morrison and Stephenson 2021.
In this version, the estimated Delta_T is smoothed over time. The result is rounded to the nearest second.</div>
<dl class="details">
<dt class="tag-version">Version:</dt>
<dd class="tag-version"><ul class="dummy"><li>M2021-03-11</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="deltat.js.html">deltat.js</a>, <a href="deltat.js.html#line1">line 1</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id=".getDeltaT"><span class="type-signature">(static) </span>getDeltaT<span class="signature">(theDate)</span><span class="type-signature"> → {number}</span></h4>
<div class="description">
Compute an estimate of Delta T, defined as: UTC = TT - Delta T. The estimate is only the quadratic part of Delta T.
</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>theDate</code></td>
<td class="type">
<span class="param-type">Date</span>
</td>
<td class="description last">date where Delta T is estimated (estimation is per exact date, not per year).</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="deltat.js.html">deltat.js</a>, <a href="deltat.js.html#line41">line 41</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
Delta T, unit is milliseconds, result reflects an integer signed number of seconds.
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">number</span>
</dd>
</dl>
</article>
</section>
</div>
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<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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