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  2. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    Leap years have two letters, so for January and February calculate the day of the week for January 1 and for March to December calculate the day of the week for October 1. Leap years are all years that divide exactly by four, with the following exceptions: Gregorian calendar – all years divisible by 100, except those that divide exactly by 400.

  3. Traditional Jewish chronology - Wikipedia

    en.wikipedia.org/wiki/Traditional_Jewish_chronology

    Jewish tradition has long preserved a record of dates and time sequences of important historical events related to the Jewish nation, including but not limited to the dates fixed for the building and destruction of the Second Temple, and which same fixed points in time (henceforth: chronological dates) are well-documented and supported by ancient works, although when compared to the ...

  4. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    [123] [124] Al-Khwarizmi's study of the Jewish calendar describes the 19-year intercalation cycle, [125] the rules for determining on what day of the week the first day of the month Tishrei shall fall, the interval between the Jewish era (creation of Adam) and the Seleucid era, and the rules for determining the mean longitude of the sun and the ...

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  6. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    360-day calendar used for accounting; 365-day calendar used for accounting; Unix time, number of seconds elapsed since 1 January 1970, 00:00:00 (UTC). Julian day, number of days elapsed since 1 January 4713 BC, 12:00:00 (UTC). Heliocentric Julian Date, Julian day corrected for differences in the Earth's position with respect to the Sun.

  7. Days of week on Hebrew calendar - Wikipedia

    en.wikipedia.org/.../Days_of_week_on_Hebrew_calendar

    The result is that all dates from 1 Nisan through 29 (or 30) Cheshvan can each fall on one of four days of the week. Dates during Kislev can fall on any of six days of the week; during Tevet and Shevat, five days; and dates during Adar (or Adar I and II, in leap years) can each fall on one of four days of the week.