The Muslim calendar is also called the Islamic calendar and the Hijri Calendar
It is still used today in many Muslim countries to determine the correct dates for religious holidays.
Based around the year Muhammad and his followers migrated from Mecca to Medina (in what is now Saudi Arabia)
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Years are counted just like the Gregorian calendar, BUT they begin in the year of Muhammad's pilgrimage from Mecca to Medina = the Hijri.
The Hijri occurred in the year 622 AD
Years are labeled with AH = anno hijri = the year of the hijri.
Current year: 1441 AH
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The Islamic calendar is lunisolar, meaning it is based off Earth’s relationship with the moon. Every revolution of the moon around Earth results in a calendar month.
Each year has 354 days and 12 months.
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The Muslim calendar is still used today.
Mostly for religious purposes, though it is used in some Muslim countries as the main calendar.