December 25. Most (but not all) Christians celebrate the birth of Jesus on this date. It was first identified by the Christian historian Sextus Julius Africanus in 221 A.D. In his five-volume treatise Chronographiai, he calculated the day of the Annunciation (Jesus’ conception) to be March 25 in the year 1 B.C.—the first day of their calendar year and 5,500 years after the Creation of the world, according to his estimates—thereby resulting in Jesus’ birth on December 25 of the same year. Later historians also came up with the date March 25 for the Annunciation, believing that there was […]