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  2. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Since in the Gregorian calendar there are 146,097 days, or exactly 20,871 seven-day weeks, in 400 years, the anchor day repeats every four centuries. For example, the anchor day of 1700–1799 is the same as the anchor day of 2100–2199, i.e. Sunday.

  3. Mesoamerican Long Count calendar - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_Long_Count...

    The remainder is 44.86849 years, which is 44 years and 317 days. The full year date is 644 CE. Now calculate the month and day number, taking into account leap days over the 44 years. In the Gregorian Calendar, every fourth year is a leap year with the exception of centuries not evenly divisible by 400 (e.g. 100, 200, 300).

  4. May 13 - Wikipedia

    en.wikipedia.org/wiki/May_13

    May 13 is the 133rd day of the year ... in the Gregorian calendar; 232 days remain until the end of the year. Events ... 1980 – An F3 tornado hits Kalamazoo ...

  5. Javanese calendar - Wikipedia

    en.wikipedia.org/wiki/Javanese_calendar

    A single windu lasts for 81 repetitions of the wetonan cycle, or 2,835 days (about 7 years 9 months in the Gregorian calendar). The tahun are lunar years, and of shorter length than Gregorian years. The names of the years in the cycle of windu are as follows (in krama/ngoko):

  6. Aztec calendar - Wikipedia

    en.wikipedia.org/wiki/Aztec_calendar

    Jaguar, 2. Eagle, and so on, as the days immediately following 13. Reed. This cycle of number and day signs would continue similarly until the 20th week, which would start on 1. Rabbit, and end on 13. Flower. It would take a full 260 days (13×20) for the two cycles (of twenty day signs, and thirteen numbers) to realign and repeat the sequence ...

  7. 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 ...

  8. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    Other formula-based calendars can have lengths which are further out of step with the solar cycle: for example, the Julian calendar has an average length of 365.25 days, and the Hebrew calendar has an average length of 365.2468 days. The Lunar Hijri calendar ("Islamic calendar") is a lunar calendar consisting of 12 lunar months in a year of 354 ...

  9. Tōnalpōhualli - Wikipedia

    en.wikipedia.org/wiki/Tōnalpōhualli

    The five relates to the juncture of the day, it comes after day 4 and before day 6 in this specific 13 day cycle. [4] The 13 day cycles are subdivisions of the larger 260 day calendar, and they pertain to different rituals and times of the year. [6] The order of the days related to all aspects of life, they dictated when was the right time to ...