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Online Ephemeris from Khaldea.com—600BC to 2400AD—Calculated for Midnight GMT; also with an Aspectarian included for years 1900 to 2005; Harmonices mundi ("The Harmony of the Worlds") in fulltext facsimile; Carnegie-Mellon University
In Akkadian, the pentecontad calendar was known as hamšâtum [2] and the period of fifteen days at the end of the year was known to Babylonians as shappatum. [3]Each fifty-day period was made up of seven weeks of seven days and seven Sabbaths, with an extra fiftieth day, [4] known as the atzeret.
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).
If conversion takes you past a February 29 that exists only in the Julian calendar, then February 29 is counted in the difference. Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000).
The slow rate of change from this value is also of note. If observations and records could have been maintained during predynastic times the Sothic rise would optimally return to the same calendar day after 1461 calendar years. This value would drop to about 1456 calendar years by the Middle Kingdom.
Some scholars, both Muslim [24] [25] and Western, [4] [6] maintain that the pre-Islamic calendar used in Central Arabia was a purely lunar calendar similar to the modern Islamic calendar. According to this view, Nasī’ is related to the pre-Islamic practices of the Meccan Arabs, where they would alter the distribution of the forbidden months ...
The year begins with the first sight of Spring.In the Julian calendar, the vernal equinox moved gradually away from 21 March.The Gregorian calendar reform restored the vernal equinox to its original date, but since the festival was by now tied to the date, not the astronomical event, Kha b-Nisan remains fixed at 21 March in the Julian reckoning, corresponding to 1 April in the Gregorian calendar.
A year in the Islamic lunar calendar consists of twelve lunar months and has only 354 or 355 days in its year. Consequently, its New Year's Day occurs ten days earlier each year relative to the Gregorian calendar. The year 2025 CE corresponds to the Islamic years AH 1446 – 1447; AH 1446 corresponds to 2024 – 2025 in the Common Era. [a]