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<p>The idea of a monthly calendar is sort of alien to the Maya, who used two cycles to track the date and <p>The idea of a monthly calendar is sort of alien to the Maya, who used two cycles to track the date and
a modified base-20 numbering system to track the exact date:</p> a modified base-20 numbering system to track the exact date:</p>
<ul> <ul>
<li>The <a href="https://en.wikipedia.org/wiki/Tzolk%CA%BCin"><strong>Tzolkʼin</strong></a> <li>The <a href="https://en.wikipedia.org/wiki/Tzolk%CA%BCin"><strong>tzolkʼin</strong></a>
cycle, which is a 260-day cycle based on combining 20 day names with 13 numbers, used for religious cycle, which is a 260-day cycle based on combining 20 day names with 13 numbers, used for religious
and ceremonial events and for divination; and ceremonial events and for divination;
</li> </li>
<li>The <a href="https://en.wikipedia.org/wiki/Haab%CA%BC"><strong>Haabʼ</strong></a> cycle, which is a <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 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>; year known as the <em>Wayebʼ</em>;
</li> </li>
@ -77,23 +77,29 @@
which counts from 0 to 17. which counts from 0 to 17.
</li> </li>
</ul> </ul>
<p>Since the <em>Haabʼ</em> is the closest equivalent to months in the Mayan system, this calendar <p>Since the <em>haabʼ</em> is the closest equivalent to months in the Mayan system, this calendar
application is based on the <em>Haabʼ</em>. This poses a problem, as in the Mayan system, the Long Count application is based on the <em>haabʼ</em>. This poses a problem, as in the Mayan system, the Long Count
is used to track the absolute date and the cycles of <em>Tzolkʼin</em> and <em>Haabʼ</em> are is used to track the absolute date and the cycles of <em>tzolkʼin</em> and <em>haabʼ</em> are
unnumbered. To mitigate this issue, we attempt to number the <em>Haabʼ</em> cycles, with the date of unnumbered. To mitigate this issue, we attempt to number the <em>haabʼ</em> cycles, with the date of
creation in cycle 0.</p> creation in cycle 0.</p>
</div> </div>
</div> </div>
<div class="card"> <div class="card">
<div class="card-body"> <div class="card-body">
<h4 class="card-title">How does Tzolkʼin work?</h4> <h4 class="card-title">How does it work?</h4>
<p class="lead">The Tzolkʼin is composed from two concurrent cycles&mdash;the number 1 to 13, and a list of <p class="lead">A year consists of 12 months of 30 days each, divided into three <em>décades</em> of 10 days
20 day names.</p> each, followed by 5 complementary days (6 in leap years).</p>
<p>The day name are: Imix, Ikʼ, Akʼbʼal, Kʼan, Chikchan, Kimi, Manikʼ, Lamat, Muluk, Ok, Chuwen, Ebʼ, Bʼen, <p>The year starts on the day of the autumnal equinox at the Paris Observatory (longitude 2°20′14.03″ E). A
Ix, Men, Kibʼ, Kabʼan, Etzʼnabʼ, Kawak, and Ajaw.</p> leap year follow directly from this definition: a year is a leap year when the next autumnal equinox
<p>Note that the day name and number cycles are completely independent and advance concurrently. This means happens 366 days later instead of the normal 365. By this definition, the year will <b>never</b> drift
that 1 Imix is followed by 2 Ikʼ and so on. There is no definite start or end to this cycle, but day with respect to the seasons.</p>
names repeat every 260 days, which is the least common multiple of 13 and 20.</p> <p>The 12 months are: <em>Vendémiaire</em>, <em>Brumaire</em>, <em>Frimaire</em>, <em>Nivôse</em>, <em>Pluviôse</em>,
<em>Ventôse</em>, <em>Germinal</em>, <em>Floréal</em>, <em>Prairial</em>, <em>Messidor</em>, <em>Thermidor</em>,
<em>Fructidor.</em> Every three months represent a season, and the endings of the names reflect this
fact.</p>
<p>The complementary days are: <em>la Fête de la Vertu</em>, <em>la Fête du Génie</em>, <em>la Fête du
Travail</em>, <em>la Fête de l'Opinion</em>, <em>la Fête des Récompenses,</em> and <em>la Fête de la
Révolution</em> (leap years only).</p>
</div> </div>
</div> </div>
<div class="card"> <div class="card">