MOHAMMEDAN CALENDAR

() A lunar calendar reckoning from the year of the hegira, 622 a. d. Thirty of its years constitute a cycle, of which the 2d, 5th, 7th, 10th, 13th, 16th, 18th, 21st, 24th, 26th, and 29th are leap years, having 355 days; the others are common, having 354 days.