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Doomsday rule. The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [ 1][ 2] drawing inspiration from ...
09-24: September 24. World Environmental Health Day [143] 09-26: September 26 since 2011 (IFEH) [144] World Cassowary Day [145] [146] 09-26: September 26. International Day of Awareness of Food Loss and Waste [147] 09-29: September 29. World Rivers Day [148] 09: Last Sunday of September.
The common year of 365 days has 52 weeksand one day, hence a common year always begins and ends on the same day of the week (for example, January 1 and December 31 will fall on a Wednesday in 2025) and the year following a common year will start on the subsequent day of the week. In common years, February has exactly four weeks, so March begins ...
French Republican Calendar of 1794, drawn by Philibert-Louis Debucourt. The French Republican calendar (French: calendrier républicain français), also commonly called the French Revolutionary calendar (calendrier révolutionnaire français), was a calendar created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and ...
The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.
Islam. There are two main holidays in Islam that are celebrated by Muslims worldwide: Eid al-Fitr and Eid al-Adha. The timing of both holidays are set by the lunar Islamic calendar, which is based upon the cycle of the moon, and so is different from the more common, European, solar-based Gregorian calendar. Every year, the Gregorian dates of ...