Islamic dynasties (coins)

The coins and history of asia. The Islamic Era year AH 1 is equal to the western year 622 AD, the year Mohammed fled from Mecca to Medina (on July 15th). Based on the lunar year, it is 11 days shorter. To (roughly) calculate an AH date from the AD, subtract 622 and then add 3%. [Persian Empire] [coins]

Link: https://coursebible.com/