Sextus Julius Africanus, a historian of the second century, maintained that Jesus of Nazareth was conceived on 25 March, which the Christian Church came to celebrate as the Feast of the Annunciation. With the term of a pregnancy being nine months, Sextus Julius Africanus held that Jesus was born on 25 December, which the Western Christian Church established as Christmas. Recorded in Sextus Julius Africanus's "Chronographiai" (221 AD), this thesis is corroborated by an interpretation of Gospel of Luke that places the appearance of Gabriel to Zechariah on the observance of Yom Kippur that occurs around October, as "the worshipers were praying outside of the Temple and not within" for "only the priest could enter the Temple at this time to conduct the proper rituals"; because Jesus was six months younger than his cousin John the Baptist, Jesus was conceived in March and born in late December.