Islamic calendar - Wikipedia
https://en.wikipedia.org/wiki/Islamic_calendar
OverviewHistoryDays of the weekMonthsYear numberingAstronomical considerationsTheological considerationsCalculated Islamic calendarsThe Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the annual fasting and the annual season for the great pilgrimage. In almost all countries …
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