![]() ![]() ![]() Thus at the end of the second year the remainder would be 22/30 day which is reduced to −8/30 day by a leap day. Whenever the remainder exceeds a half day (15/30 day), then a leap day is added to that year, reducing the remainder by one day. Noting that the average year has 354 11/30 days and a common year has 354 days, at the end of the first year of the 30-year cycle the remainder is 11/30 day. In its most common form there are 11 leap years in a 30-year cycle. The odd numbered months have 30 days and the even numbered months have 29 days, except in a leap year when the 12th and final month Dhu al-Hijjah has 30 days. It is their belief that all Fatimid Imams and their Da'is have followed this tradition.Įach year has 12 months. It is believed that when Ali drew up this calendar, the previous events of the earlier prophets also fell into line with this calendar. ![]() It is used by some Muslims in everyday life, particularly in Ismaili and Shi'a communities, believing that this calendar was developed by Ali. An example is the Fatimid or Misri calendar. It is now used by historians to convert an Islamic date into a Western calendar when no other information (like the day of the week) is available. It was developed by early Muslim astronomers of the second hijra century (the 8th century of the Common Era) to provide a predictable time base for calculating the positions of the moon, sun, and planets. It has the same numbering of years and months, but the months are determined by arithmetical rules rather than by observation or astronomical calculations. The Tabular Islamic calendar ( Arabic: التقويم الهجري المجدول, romanized: altaqwim alhijriu almujadwal) is a rule-based variation of the Islamic calendar. ![]()
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