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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    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 ...

  3. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    13 Ordibehesht 1403. 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 May 2024" is ten days after "15 May 2024". The date of a particular event depends on the observed time ...

  4. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  5. Ethiopian calendar - Wikipedia

    en.wikipedia.org/wiki/Ethiopian_calendar

    The Ethiopian calendar has twelve months, all thirty days long, and five or six epagomenal days, which form a thirteenth month. [2] The Ethiopian months begin on the same days as those of the Coptic calendar, but their names are in Ge'ez. A sixth epagomenal day is added every four years, without exception, on 29 August of the Julian calendar ...

  6. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    Leap year. A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. [1]

  7. Dating creation - Wikipedia

    en.wikipedia.org/wiki/Dating_creation

    Dating precisely the beginning of the start of the 12,000th year cosmogony rests solely on the date Zoroaster is estimated to have been born. Since Zoroaster was born himself at the end of the 9th millennium (just before the 9,000th year), the date of creation can be calculated by counting back 8,900–9,000 years.

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