The Islamic (Hijri) Calendar
HISTORY AND MOTIVATION The Islamic Calendar, which is based purely on lunar cycles, was first introduced in 638 C.E. by the close companion of the Prophet (PBUH) and the second Caliph, `Umar ibn Al-KHaTTab (592-644 C.E.) RAA. He did it in an attempt to rationalize the various, at times conflicting, dating systems used during his [...]

