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  2. Solar cycle (calendar) - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_(calendar)

    Solar cycle (calendar) The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th. There are 7 possible days to start a leap year, making a ...

  3. Chinese zodiac - Wikipedia

    en.wikipedia.org/wiki/Chinese_zodiac

    Chinese zodiac. The Chinese zodiac is a traditional classification scheme based on the Chinese calendar that assigns an animal and its reputed attributes to each year in a repeating twelve-year cycle. [1] In traditional Chinese culture, the Chinese zodiac is very important and exists as a reflection of Chinese philosophy and culture. [2]

  4. Solar Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_Hijri_calendar

    The accuracy of the system proposed by Birashk and other recent authors, such as Zabih Behruz, has been thoroughly refuted and shown to be less precise than the traditional 33-year cycle. Each 2820-year great grand cycle proposed by Birashk contains 2137 normal years of 365 days and 683 leap years of 366 days, with the average year length over ...

  5. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...

  6. 2012 phenomenon - Wikipedia

    en.wikipedia.org/wiki/2012_phenomenon

    The date of 13.0.0.0.0 4 Ahau 3 Kʼankʼin is usually correlated as 21 or 23 December 2012. The 2012 phenomenon was a range of eschatological beliefs that cataclysmic or transformative events would occur on or around 21 December 2012.

  7. Chinese calendar correspondence table - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar...

    This Chinese calendar correspondence table shows the stem/branch year names, correspondences to the Western ( Gregorian) calendar, and other related information for the current, 79th Sexagenary cycle of the Chinese calendar based on the 2697 BC epoch or the 78th cycle if using the 2637 BC epoch. Year in cycle. s,b. Gānzhī (干支) Year of the ...

  8. Metonic cycle - Wikipedia

    en.wikipedia.org/wiki/Metonic_cycle

    In the Babylonian and Hebrew lunisolar calendars, the years 3, 6, 8, 11, 14, 17, and 19 are the long (13-month) years of the Metonic cycle. This cycle forms the basis of the Greek and Hebrew calendars. A 19-year cycle is used for the computation of the date of Easter each year. The Babylonians applied the 19-year cycle from the late sixth ...

  9. Cosmic Calendar - Wikipedia

    en.wikipedia.org/wiki/Cosmic_Calendar

    The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science . In this visualization, the Big Bang took place at the beginning of January 1 at midnight, and the ...