Islamic calendar is Lunar system Calendar. Christian calendar is solar system calendar.
the zero date of Islamic calendar marks the event of migration (Hijra) of prophet Muhammad from Mecca (or Makkah) to Medina (or Madinah) in Saudi Arabia when informed by God that the unbelievers in Mecca planned to assasinate him.The zero date of the Christian Calendar, basically marks the birth Jesus.
According to both the Answers article on Jilian calendar and the article regarding the Gregorian calendar; the Jilian calendar did not do a very good job of calculating leap years. It takes the Earth...
The Islamic calendar is lunar, which means it's based on the phases of the moon. It is either 354 or 355 days long, and began in the year 622 CE when the Prophet Muhammad migrated from Mecca to...
The Islamic calendar is lunar only, which means it is based on the phases of the moon. It is 354-355 days long. The Jewish calendar is lunisolar, which is a combination of the lunar calendar and the...