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  2. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Doomsday rule. The doomsday's anchor day calculation is effectively calculating the number of days between any given date in the base year and the same date in the current year, then taking the remainder modulo 7. When both dates come after the leap day (if any), the difference is just 365y + ⁠ y / 4 ⁠ (rounded down). But 365 equals 52 × 7 ...

  3. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    March 0 is used in Doomsday algorithm calculations. [23] March 2 was celebrated as February 30 by Lin-Manuel Miranda and Weird Al Yankovic for the release date of Yankovic's "The Hamilton Polka". [24] In November 2010 it was discovered that a Hanshin Tigers wall calendar incorrectly included the date November 31. Fans who had bought the ...

  4. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    The "doomsday" concept in the doomsday algorithm is mathematically related to the Dominical letter. Because the letter of a date equals the dominical letter of a year (DL) plus the day of the week (DW), and the letter for the doomsday is C except for the portion of leap years before February 29 in which it is D, we have:

  5. List of dates predicted for apocalyptic events - Wikipedia

    en.wikipedia.org/wiki/List_of_dates_predicted...

    This is an accepted version of this page This is the latest accepted revision, reviewed on 10 January 2025. This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. The Last Judgment by painter Hans Memling. In Christian belief, the Last Judgement is an apocalyptic event where God makes a final ...

  6. 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.

  7. Doomsday - Wikipedia

    en.wikipedia.org/wiki/Doomsday

    Doomsday may refer to: Eschatology , a time period described in the eschatological writings in Abrahamic religions and in doomsday scenarios of non-Abrahamic religions. Global catastrophic risk , a hypothetical event explored in science and fiction where human civilization or life is at risk of partial or complete destruction.

  8. Heinz von Foerster - Wikipedia

    en.wikipedia.org/wiki/Heinz_von_Foerster

    Heinz von Foerster (né von Förster; November 13, 1911 – October 2, 2002) was an Austrian-American scientist combining physics and philosophy, and widely attributed as the originator of second-order cybernetics.

  9. Apocalypticism - Wikipedia

    en.wikipedia.org/wiki/Apocalypticism

    Apocalypticism is the religious belief that the end of the world is imminent, even within one's own lifetime. [1] This belief is usually accompanied by the idea that civilization will soon come to a tumultuous end due to some sort of catastrophic global event.