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  2. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    Thurston 1909 continues: . Now, as a moment's reflection shows, if 1 January is a Sunday, all the days marked by A will also be Sundays; if 1 January is a Saturday, Sunday will fall on 2 January, which is a B, and all the other days marked B will be Sundays; if 1 January is a Monday, then Sunday will not come until 7 January, a G, and all the days marked G will be Sundays ...

  3. CMS reveals calendar options for 2024-25 year. District wants ...

    www.aol.com/news/cms-reveals-calendar-options...

    Both potential CMS calendars have a 14-day winter break beginning for students Dec. 20, 2025 through Jan. 4, 2026, two days shorter than the 2024-25 school year and the same number of days as this ...

  4. George Washington Academy - Wikipedia

    en.wikipedia.org/wiki/George_Washington_Academy

    GWA is a project of a foreign non-profit association registered in Morocco and does not exist as an independent legal entity. GWA is one of only five schools throughout Morocco included in the Bilateral Agreement of 2012 between the United States and the Kingdom of Morocco to be recognized officially as an American School in Morocco.

  5. 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.

  6. Year-round school in the United States - Wikipedia

    en.wikipedia.org/wiki/Year-round_school_in_the...

    Year-round school is the practice of having students attend school without the traditional summer vacation, which is believed to have been made necessary by agricultural practices in the past, the agrarian school calendar consisted of a short winter and a short summer could help with planting in the spring and harvest in the fall. In cities ...

  7. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    For example, the Gregorian date Wednesday, 12 February 2025 corresponds to day number 3 in the week number 07 of 2025, and is written as 2025-W07-3 (in extended form) or 2025W073 (in compact form). The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of ...

  8. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities. In a lunar calendar, the month approximates the cycle of the moon phase. Consecutive days may be grouped into other periods such as the week.

  9. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    In order to correct for calendar drift, 10 days were skipped, so doomsday moved back 10 days (i.e. 3 weekdays): Thursday, October 4 (Julian, doomsday is Wednesday) was followed by Friday, October 15 (Gregorian, doomsday is Sunday). The table includes Julian calendar years, but the algorithm is for the Gregorian and proleptic Gregorian calendar ...