What is the significance of the Islamic calendar starting from 621 AD?

Answer 1

Prophet Muhammad (peace be upon Him) and his followers migrate from Mecca to Medina between June 21st and July 2nd in 622 AD.

Follower who took journey From Mecca To Madina called Muhajireen And

People Who welcomed Prophet Muhammad (PBUH) in Madina called Ansar (helper)

Migrated Because so that they can peacefully spread the word of "there is no God but Allah"

Answer 2

Answer

Year 622 AD is the year of prophet Muhammad migration (Hijra) from Makkah (Mecca) to Medina; in the current country called Saudi Arabia; per God command to him after God informed him of the unbelievers plan to assassinate him, It was the start of the Islamic Hijra lunar year.

Answer 3

Actually, it's AD 622, the date of the Hijira, or flight to Yathrib. The Islamic calendar is based on the Moon and so is out-of sync with the adjusted solar calendar most of the world uses. This has two effects. One is that the months "slip" through the seasons at a rate of 11 days a year (Islamic year has only 354 days, not 365) so festivals aren't in the same seasons. In particular, this year's Ramadan will will especially onerous since it falls in mid-summer when the days are long and the weather is hot, a tough time to water-fast all the daylight hours. In 17 years, Ramadan will be in mid-winter, when it's much easier on the fasters. The other effect is that an observant Muslim to thinks he's 35 years old is really only 34.

Answer 4

It is the year of prophet Muhammad migration (Hijra) from Makkah (Mecca) to Medina per God command to him after God informed him of the unbelievers plan to assassinate him, It was the start of the Islamic Hijra lunar year.