Calendrical calculation

<p>A calendrical calculation is a <a href="/facts/Calculation/MHq42Sjw">calculation</a> concerning <a href="/facts/Calendar_date/3Ive9Wwb">calendar dates</a>. Calendrical calculations can be considered an area of <a href="/facts/Applied_mathematics/qyqklXXm">applied mathematics</a>.
Some examples of calendrical calculations:
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<ul><li>Converting a <a href="/facts/Julian_calendar/EQBtA1ML">Julian</a> or <a href="/facts/Gregorian_calendar/axJfTXV1">Gregorian calendar</a> date to its <a href="/facts/Julian_day/mLwtKoYQ">Julian day</a> number and vice versa (see <a href="/facts/Julian_day/mLwtKoYQ">§ Julian day number calculation</a> within that article for details).</li>
<li>The number of days between two dates, which is simply the difference in their Julian day numbers.</li>
<li>The dates of moveable holidays, like Christian <a href="/facts/Easter/LYPGCQge">Easter</a> (the calculation is known as <a href="/facts/Computus/HUosdPeP">Computus</a>) followed up by <a href="/facts/Feast_of_the_Ascension/ood2IcJf">Ascension Thursday</a> and <a href="/facts/Pentecost/FdXYJFU2">Pentecost</a> or <a href="/facts/Advent/3MDuuX34">Advent</a> Sundays, or the Jewish <a href="/facts/Passover/klu4sC0g">Passover</a>, for a given year.</li>
<li>Converting a date between different calendars. For instance, dates in the <a href="/facts/Gregorian_calendar/axJfTXV1">Gregorian calendar</a> can be converted to dates in the <a href="/facts/Islamic_calendar/7n4UBAYy">Islamic calendar</a> with the <a href="/facts/Kuwaiti_algorithm/hhPTXw38">Kuwaiti algorithm</a>.</li>
<li><a href="/facts/Calculating_the_day_of_the_week/D8FMPb9K">Calculating the day of the week</a>.</li></ul>
<p>Calendrical calculation is one of the five major <a href="/facts/Savant_syndrome/J6mKk1TP">Savant syndrome</a> characteristics.
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Calendrical calculation open-in-new

Calendrical calculation