It calculates the exact date Zachariah of the priestly course Abijah served in the Temple when John the Baptist was conceived in Elizabeth, six months later Jesus was conceived in Mary, and nine months later Jesus was born on the first day of the Feast of Booths in 8 B.C. It concludes that it is necessary that the Feast of Booths pertain to the Messiah because burnt offerings are made to the Lord each day by the residents. It supports that the great feasts foreshadow aspects of the accomplishments of the Messiah. It upholds the veracity of Luke. It demonstrates that God is true to His word. It is correct and exact. It calculates the dates of service of the priestly course of Abijah from 1 B.C. to 9 B.C.