The Islamic calendar or Muslim calendar or Hijri calendar (Arabic: التقويم الهجري; at-taqwīm al-hijrī; Persian: تقویم هجری قمری taqwīm-e hejri-ye qamari; Turkish: Hicri Takvim) is a lunar calendar based on 12 lunar months in a year of 354 or 355 days, used to date events in many Muslim countries (concurrently with the Gregorian calendar), and used by Muslims everywhere to determine the proper day on which to celebrate Islamic holy days and fes...
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Islamic calendar
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Gregorian calendar
The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was named, on 24 February 1582 by the papal bull Inter gravissimas. It was adopted later that year by a... -
Hebrew calendar
The Hebrew calendar (Hebrew: הלוח העברי ha'luach ha'ivri) or Jewish calendar is a lunisolar calendar used by Jews, and in recent decades, by a growing number of Christians. Today, the calendar is predominantly used for religious observances, but is also employed by Jewish farmers in Israel as an... -
Julian calendar
The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC (709 ab urbe condita). It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year, known at least...