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  2. 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 ...

  3. Category:2027 in the United States by month - Wikipedia

    en.wikipedia.org/wiki/Category:2027_in_the...

    This page was last edited on 27 January 2025, at 02:05 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  4. 2027 - Wikipedia

    en.wikipedia.org/wiki/2027

    2027 will be a common year starting on Friday of the Gregorian calendar, the 2027th year of the Common Era (CE) and Anno Domini (AD) designations, the 27th year of the 3rd millennium and the 21st century, and the 8th year of the 2020s decade.

  5. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).

  6. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The term Julian date may also refer, outside of astronomy, to the day-of-year number (more properly, the ordinal date) in the Gregorian calendar, especially in computer programming, the military and the food industry, [10] or it may refer to dates in the Julian calendar. For example, if a given "Julian date" is "October 5, 1582", this means ...

  7. Determination of the day of the week - Wikipedia

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

    The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

  8. Date of Easter - Wikipedia

    en.wikipedia.org/wiki/Date_of_Easter

    The range of dates in the Gregorian calendar of the Eastern Paschal full moon moves one day later every time there is a solar correction, so from 2100 to 2199 it will be 5 April to 9 May. At present there are five years per cycle when the Eastern Easter is several weeks later than the Western, at golden numbers 3, 8, 11, 14, and 19.

  9. Template:Infobox holiday - Wikipedia

    en.wikipedia.org/wiki/Template:Infobox_holiday

    If set to a non-blank value, auto-formatted dates will be displayed in "month day, year" format instead of the default "day month year" order. firsttime first time/year the holiday was observed (if available) lasttime last time/year the holiday was observed (if no longer observed) celebrations This contains the celebrations that occur on the ...