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The Enoch calendar is an ancient calendar described in the pseudepigraphal Book of Enoch.It divided the year into four seasons of exactly 13 weeks. Each season consisted of two 30-day months followed by one 31-day month, with the 31st day ending the season, so that Enoch's year consisted of exactly 364 days.
Relationship between the current Sexagenary cycle and Gregorian calendar. This Chinese calendar correspondence table shows the stem/branch year names, correspondences to the Western 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.
Because the Julian year is longer than the tropical year by about 11.3 minutes on average (or 1 day in 128 years), the calendar "drifted" with respect to the two equinoxes – so that in 300 AD the spring equinox occurred on about 21 March, and by the 1580s AD it had drifted backwards to 11 March.
Since the Islamic calendar is a purely lunar calendar of about 354 or 355 days, its year count increases faster than that of solar and lunisolar calendars. S.H. (or SH) [citation needed] is used by the Iranian calendar to denote the number of solar years since the Hijra. The year beginning at the vernal equinox equals the number of the ...
The epoch of the Islamic calendar is the Hijra (AD 622). The year count in this calendar shifts relative to the solar year count, as the calendar is purely lunar: its year consists of 12 lunations and is thus ten or eleven days shorter than a solar year. This calendar denotes "lunar years" as Anno Hegiræ ([since] the year of the Hijra) or AH.
The (19-year) Metonic cycle is a lunisolar cycle, as is the (76-year) Callippic cycle. [8] An important example of an application of the Metonic cycle in the Julian calendar is the 19-year lunar cycle insofar as provided with a Metonic structure. [9] Meton introduced the 19 year cycle to the Attic calendar in 432 BC.
Various ancient Greek calendars began in most states of ancient Greece between autumn and winter except for the Attic calendar, which began in summer.. The Greeks, as early as the time of Homer, appear to have been familiar with the division of the year into the twelve lunar months but no intercalary month Embolimos or day is then mentioned, with twelve months of 354 days. [1]
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