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  2. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    According to Thurston 1909, p. 109 dominical letters are:. a device adopted from the Romans by the old chronologers to aid them in finding the day of the week corresponding to any given date, and indirectly to facilitate the adjustment of the 'Proprium de Tempore' to the 'Proprium Sanctorum' when constructing the ecclesiastical calendar for any year.

  3. Names of the days of the week - Wikipedia

    en.wikipedia.org/wiki/Names_of_the_days_of_the_week

    The Babylonians invented the actual [clarification needed] seven-day week in 600 BCE, with Emperor Constantine making the Day of the Sun (dies Solis, "Sunday") a legal holiday centuries later. [2] In the international standard ISO 8601, Monday is treated as the first day of the week, but in many countries it is counted as the second day of the ...

  4. 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.

  5. Tridentine calendar - Wikipedia

    en.wikipedia.org/wiki/Tridentine_calendar

    In leap years, a day is added and it is of 29 days but the Feast of St. Matthias is celebrated on the 25th day and then is said twice Sexto Kalendas, that is on the 24th and 25th day, and thus the Dominical letter is changed to the one above, that if it be B, into A, if it be C, into B, similarly also in the others.

  6. Category:Days of the week - Wikipedia

    en.wikipedia.org/wiki/Category:Days_of_the_week

    Pages in category "Days of the week" The following 12 pages are in this category, out of 12 total. ... Determination of the day of the week; 0–9. Monday; Tuesday ...

  7. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (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. The formula is w = (d + m + y + c) mod 7.

  8. 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 ...

  9. General Roman Calendar - Wikipedia

    en.wikipedia.org/wiki/General_Roman_Calendar

    The General Roman Calendar (GRC) is the liturgical calendar that indicates the dates of celebrations of saints and mysteries of the Lord (Jesus Christ) in the Roman Rite of the Catholic Church, wherever this liturgical rite is in use. These celebrations are a fixed annual date, or occur on a particular day of the week.