when do coptic orthodox celebrate christmas

The Coptic Orthodox Church follows the Julian calendar, which is 13 days behind the Gregorian calendar. As such, Coptic Christmas is celebrated on January 7th. The date was chosen to coincide with the ancient Egyptian celebration of the winter solstice, which was later incorporated into the Coptic calendar as the Feast of Nativity. While the rest of the world celebrates Christmas on December 25th, Coptic Christians celebrate the birth of Jesus Christ on January 7th.