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A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).
His correlation argues that the first day of the Mexica year was February 13 of the old Julian calendar or February 23 of the current Gregorian calendar. Using the same count, it has been the date of the birth of Huitzilopochtli , the end of the year and a cycle or "Tie of the Years", and the New Fire Ceremony , day-sign 1 Tecpatl of the year 2 ...
In finance, date rolling occurs when a payment day or date used to calculate accrued interest falls on a holiday, according to a given business calendar. In this case, the date is moved forward or backward in time such that it falls in a business day, according to the same business calendar. The choice of the date rolling rule is conventional.
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In order to correct for calendar drift, 10 days were skipped, so doomsday moved back 10 days (i.e. 3 days): Thursday, October 4 (Julian, doomsday is Wednesday) was followed by Friday, October 15 (Gregorian, doomsday is Sunday). The table includes Julian calendar years, but the algorithm is for the Gregorian and proleptic Gregorian calendar only.
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.
The tabular Byzantine calendar is used to calculate the date of Easter. It dates back to AD 284, when the new moon fell on the fifth epagemonal day of the Alexandrian calendar (28 August). Eusebius (vii.32) recounts that Anatolius of Laodicea was the first to arrange the 19-years cycle (when the new moon returns to the same Julian date) for ...
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