Last month, in Advent, we had several threads touching on the date the Church celebrates Christmas and the possibility of determining the historical date of the birth of Jesus. One approach mentioned by several posters—in particular @PeterT, @MagdalenaRita, and @Mintaka—is to match up Luke 1:5, specifying that John the Baptist’s father Zacharias belonged to the priestly course of Abijah, with 1 Chron 24:10, where Abijah is listed among the twenty-four divisions or “courses” of Temple priests. D…