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<p>In Swiss Ephemeris, we have an implementation of delta T which
tries to be state of the art.</p>
<p>See documentation here<br>
<a class="moz-txt-link-freetext" href="https://www.astro.com/swisseph/swephprg.htm#_Toc11319101">https://www.astro.com/swisseph/swephprg.htm#_Toc11319101</a></p>
<p>and source code here<br>
<a class="moz-txt-link-freetext" href="https://www.astro.com/ftp/swisseph/src/">https://www.astro.com/ftp/swisseph/src/</a></p>
<p>The delta T source code is in file swephlib.c<br>
<a class="moz-txt-link-freetext" href="https://www.astro.com/ftp/swisseph/src/swephlib.c">https://www.astro.com/ftp/swisseph/src/swephlib.c</a></p>
<p>The implementation is complicated by the fact that we try to be
consistent with different versions of JPL ephemerides, which use
different values for the Moon's tidal acceleration.<br>
</p>
<p>All the code of Swiss Ephemeris is published under GPL.</p>
<p>A commercial license is available for those who do keep their
projects free of the obligations arising from Gnu public license,<br>
</p>
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<div class="moz-cite-prefix">On 27.07.19 05:16, David Patte wrote:<br>
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cite="mid:089c9847-1142-6979-f914-967ce2e68d25@relativedata.com">
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<p>For my products I use an algorithm (Meeus; Astronomical
Algorithms 1998) to 'predict' deltaT into the future. Does
anyone have a good source for a more recent algorithm that takes
into account IERS values since 1998?</p>
<br>
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