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  2. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    For determination of the day of the week (January 1, 2000, Saturday) the day of the month: 1; the month: 6; the year: 0; the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar 0; adding 1 + 6 + 0 + 0 = 7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday.

  3. Hanke–Henry Permanent Calendar - Wikipedia

    en.wikipedia.org/wiki/Hanke–Henry_Permanent...

    Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.

  4. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.

  5. Common year starting on Thursday - Wikipedia

    en.wikipedia.org/wiki/Common_year_starting_on...

    The most recent year of such kind was 2015 and the next one will be 2026 in the Gregorian calendar [1] or, likewise, 2021 and 2027 in the obsolete Julian calendar, see below for more. This is the only common year with three occurrences of Friday the 13th : those three in this common year occur in February , March , and November .

  6. Leap year starting on Sunday - Wikipedia

    en.wikipedia.org/wiki/Leap_year_starting_on_Sunday

    The most recent year of such kind was 2012 and the next one will be 2040 in the Gregorian calendar [1] or, likewise 2024 and 2052 in the obsolete Julian calendar. This is the only leap year with three occurrences of Friday the 13th : those three in this leap year occur three months (13 weeks) apart: in January , April , and July .

  7. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    To find which day of the week Christmas Day of 2021 is, proceed as follows: in the year 2021, doomsday is on Sunday. Since December 12 is a doomsday, December 25, being thirteen days afterwards (two weeks less a day), fell on a Saturday. Christmas Day is always the day of the week before doomsday.

  8. Days of week on Hebrew calendar - Wikipedia

    en.wikipedia.org/.../Days_of_week_on_Hebrew_calendar

    In Israel, chametz cannot be consumed on the day after Passover because it cannot be purchased on the Sabbath or Yom Tov. In the diaspora, the usual Torah reading of the eighth day of Passover (Deuteronomy 15:19–16:17) is extended to its length on Shemini Atzeret (Deuteronomy 14:22–16:17) to accommodate the seven readings on the Sabbath.

  9. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    The bull refers to "the explanation of our calendar" and to a canon related to the dominical letter. To accompany the bull there were six chapters of explanatory rules ('canons'), [ 3 ] and some of these (canons 1, 2, 4) refer to a book entitled Liber novæ rationis restituendi calendarii Romani [ 4 ] for a fuller explanation of the tables than ...