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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. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Applying the Doomsday algorithm involves three steps: determination of the anchor day for the century, calculation of the anchor day for the year from the one for the century, and selection of the closest date out of those that always fall on the doomsday, e.g., 4/4 and 6/6, and count of the number of days between that date and the date in ...

  4. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Within each 100-year block, the cyclic nature of the Gregorian calendar proceeds in the same fashion as its Julian predecessor: A common year begins and ends on the same day of the week, so the following year will begin on the next successive day of the week. A leap year has one more day, so the year following a leap year begins on the second ...

  5. Determination of the day of the week - Wikipedia

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

    "Corresponding months" are those months within the calendar year that start on the same day of the week. For example, September and December correspond, because 1 September falls on the same day as 1 December (as there are precisely thirteen 7-day weeks between the two dates).

  6. Tridentine calendar - Wikipedia

    en.wikipedia.org/wiki/Tridentine_calendar

    The Tridentine calendar is the calendar of saints to be ... that is on the 24th and 25th day, and thus the Dominical letter is ... 13 November: 14 November: 15 ...

  7. Common year starting on Thursday - Wikipedia

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

    A common year starting on Thursday is any non-leap year (i.e. a year with 365 days) that begins on Thursday, 1 January, and ends on Thursday, 31 December. Its dominical letter hence is D . 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 ...

  8. List of days of the year - Wikipedia

    en.wikipedia.org/wiki/List_of_days_of_the_year

    On This Day; BBC: On This Day; The New York Times: On This Day; Library of Congress: Today in History; History Channel (US): This Day in History; History Channel (UK): This Day in History; New Zealand Government: Today in New Zealand History Archived 2017-04-14 at the Wayback Machine; Computer History Museum: This Day in History

  9. Common year starting on Tuesday - Wikipedia

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

    A common year starting on Tuesday is any non-leap year (i.e. a year with 365 days) that begins on Tuesday, 1 January, and ends on Tuesday, 31 December. Its dominical letter hence is F . The most recent year of such kind was 2019 and the next one will be 2030, or, likewise, 2025 and 2031 in the obsolete Julian calendar , see below for more .