Noun
the lunar calendar used by Muslims; dates from 622 AD (the year of the Hegira); the beginning of the Muslim year retrogresses through the solar year completing the cycle every 32 years
Source: WordNetThis hijra, or migration, would be a turning point in the Prophet's mission and would mark the very beginning of the Muslim calendar. Source: Internet
Since the Muslim calendar is based on 12 lunar months amounting to about 354 days, the Muslim New Year occurs about eleven days earlier each year in relation to the Gregorian calendar, with two Muslim New Years falling in Gregorian year 2008. Source: Internet
The reason for the discrepancy is that the Gregorian year (like the Julian) is slightly too long, so the Gregorian date for a given AH date will be earlier and the Muslim calendar catches up sooner. Source: Internet