Islamic calendar

The Islamic calendar or Muslim calendar (also called 'Hijri calendar') is the calendar used to date events in predominantly Muslim countries, and used by Muslims everywhere to determine the proper day on which to celebrate Muslim holy days. It is a purely lunar calendar having 12 lunar months in a year of about 354 days. Because this lunar year is about 11 days shorter than the solar year, Muslim holy days, although celebrated on fixed dates in their own calendar, usually shift 11 days earlier each successive solar year, such as a year of the Gregorian calendar. Islamic years are also called Hijra years because the first year was the year during which the Hijra occurred—Muhammad's emigration from Mecca to Medina. Thus each numbered year is designated either H or AH, the latter being the initials of the Latin anno Hegirae (in the year of the Hijra).

Current correlations

Portions of the Islamic calendar years 1424 and 1425 occur in the Gregorian calendar year 2004. January 1, 2004 is 8 Dhu al-Qa'da 1424 AH. 1 Muharram 1425 AH is February 22, 2004.

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For a very rough estimate, multiply the Islamic year number by 0.97, and then add 622 to get the Gregorian year number.

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The Islamic calendar year of 1429 occurs entirely within the Gregorian calendar year of 2008. Such years occur once every 33 or 34 Islamic years (32 or 33 Gregorian years).

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More are listed here:

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