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mcal: explain what Haabʼ is

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and ceremonial events and for divination;
</li>
<li>The <a href="https://en.wikipedia.org/wiki/Haab%CA%BC"><strong>Haabʼ</strong></a> cycle, which is a
365-day cycle consisting of 18 &ldquo;months&rdquo; of 20 day each, plus 5 days at the end of the
year known as the <em>Wayebʼ</em>;
365-day cycle consisting of 18 months of 20 day each, plus 5 days at the end of the year known as
the <em>Wayebʼ</em>;
</li>
<li>The <a href="https://en.wikipedia.org/wiki/Mesoamerican_Long_Count_calendar"><strong>Long
Count</strong></a>, a modified base-20 system used to represent the number of days since the
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names repeat every 260 days, which is the least common multiple of 13 and 20.</p>
</div>
</div>
<div class="card">
<div class="card-body">
<h4 class="card-title">How does Haabʼ work?</h4>
<p class="lead">The Haabʼ is a cycle of 18 months of 20 days each, counted from 0 to 19, plus 5 extra days
at the end of the year called the <em>Wayebʼ</em>.</p>
<p>The 18 normal months are named Pop, Woʼ, Sip, Sotzʼ, Sek, Xul, Yaxkʼin, Mol, Chʼen, Yax, Sakʼ, Keh, Mak,
Kʼankʼin, Muwan, Pax, Kʼayabʼ, and Kumkʼu.</p>
<p>The days of each month are counted from 0. So a year would start at 0 Pop, followed by 1 Pop, etc. The
month of Pop ends at 19 Pop, which is followed by 0 Woʼ. The pattern continues until 19 Kumkʼu, after
which we have 0 Wayebʼ. The last day of the year is 4 Wayebʼ.</p>
<p>Note that in the traditional Mayan system, the Haabʼ cycle repeats, but the iterations (&ldquo;years&rdquo;)
are <strong>not</strong> numbered. Years were implemented in this version to allow the exact screen to
be identified.</p>
</div>
</div>
<div class="card">
<div class="card-body">
<h4 class="card-title">What's so special about this version?</h4>