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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 ...
The Shahanshahi calendar (also Shahenshahi, Shahenshai) or "imperial" calendar is the system described in Denkard, a 9th-century Zoroastrian text. It explicitly acknowledged several methods of intercalation: [24] a leap-day every 4 years; adding ten days every 40 years; a leap-month of 30 days once every 120 years;
A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...
Akan calendar. The Akan people (a Kwa group of West Africa) appear to have used a traditional system of timekeeping based on a six-day week (known as nnanson "seven-days" via inclusive counting ). The Gregorian seven-day week is known as nnawɔtwe (eight-days). The combination of these two system resulted in periods of 40 days, known as ...
Calendar date. 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 July 2024" is ten days after "15 July 2024". The date of a particular event depends on the observed time zone.
No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.
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