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<!DOCTYPE html>
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<title>Jewish Calendar References | Hebcal</title>
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<a href="/">Home</a>
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<a href="https://github.com/hebcal"><svg class="icon" viewBox="0 0 32 32"><path d="M16 0.395c-8.836 0-16 7.163-16 16 0 7.069 4.585 13.067 10.942 15.182 0.8 0.148 1.094-0.347 1.094-0.77 0-0.381-0.015-1.642-0.022-2.979-4.452 0.968-5.391-1.888-5.391-1.888-0.728-1.849-1.776-2.341-1.776-2.341-1.452-0.993 0.11-0.973 0.11-0.973 1.606 0.113 2.452 1.649 2.452 1.649 1.427 2.446 3.743 1.739 4.656 1.33 0.143-1.034 0.558-1.74 1.016-2.14-3.554-0.404-7.29-1.777-7.29-7.907 0-1.747 0.625-3.174 1.649-4.295-0.166-0.403-0.714-2.030 0.155-4.234 0 0 1.344-0.43 4.401 1.64 1.276-0.355 2.645-0.532 4.005-0.539 1.359 0.006 2.729 0.184 4.008 0.539 3.054-2.070 4.395-1.64 4.395-1.64 0.871 2.204 0.323 3.831 0.157 4.234 1.026 1.12 1.647 2.548 1.647 4.295 0 6.145-3.743 7.498-7.306 7.895 0.574 0.497 1.085 1.47 1.085 2.963 0 2.141-0.019 3.864-0.019 4.391 0 0.426 0.288 0.925 1.099 0.768 6.354-2.118 10.933-8.113 10.933-15.18 0-8.837-7.164-16-16-16z"></path></svg>GitHub</a>
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<h1>Jewish Calendar References</h1>
</header>
<main>
<h2>Sunrise Calculation</h2>
<p>The NOAA has a page describing the sunrise calculation <a href="http://www.srrb.noaa.gov/highlights/sunrise/solareqns.PDF">here</a> (pdf).
</p>
<h2>Jewish Calendar References</h2>
The algorithms for hebcal were taken from
<a href="http://www.gnu.org/software/emacs/emacs.html">Emacs 19's</a>
calendar routines by
<a href="http://emr.cs.uiuc.edu/~reingold/">Edward M. Reingold</a> and
<a href="http://www-sal.cs.uiuc.edu/~nachum/">Nachum Dershowitz</a>.
Their program is extremely clear and provides many instructive
examples of fine calendar code in emacs-LISP.
<p>
<h3>Books</h3>
<dl>
<dt><a href="http://www.amazon.com/exec/obidos/ASIN/0940118173/hebcal-20">Understanding the Jewish Calendar</a>
<dd>by Rabbi Nathan Bushwick. A well written treatment of the Jewish Calendar. Good bibliography.
<dt>Encyclopedia Judaica
<dd>Always the right place to start. Check out their entry on <tt>Calendar</tt>
<dt><a href="http://www.amazon.com/exec/obidos/ASIN/0521564743/hebcal-20">Calendrical Calculations</a>
<dd>Reingold and Dershowitz's own text. A keeper.
</dl>
<h3> Other Good References</h3>
<dl>
<dt><a href="http://hebrewcalendar.tripod.com/">Hebrew Calendar
Science and Myths</a>
<dd>Fun stuff, page with neat-o facts about the
arithmetic of the Jewish Calendar and its consequences.</dd>
</dl>
</main>
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Last modified: Sun Jul 7 08:20:13 PDT 2024
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