While much of the world celebrates the birth of Yeshua on the 25th of December, can the actual day of Jesus' birth be determined from scripture?
Luke 1:5 There was in the days of Herod, the king of Judaea, a certain priest named Zacharias, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elisabeth....8 And it came to pass, that while he executed the priest's office before God in the order of his course, .....23 And it came to pass, that, as soon as the days of his ministration were accomplished, he departed to his own house. 24 And after those days his wife Elisabeth conceived, ...
First clue... Zacharias and the "course" of Abia. There are 24 Courses of the Temple Priesthood.
7. But David, being desirous of ordaining his son king of all the people, called together their rulers to Jerusalem, with the priests and the Levites; and having first numbered the Levites, he found them to be thirty-eight thousand, from thirty years old to fifty; out of which he appointed twenty-three thousand to take care of the building of the temple, and out of the same, six thousand to be judges of the people and scribes, four thousand for porters to the house of God, and as many for singers, to sing to the instruments which David had prepared, as we have said already. He divided them also into courses: and when he had separated the priests from them, he found of these priests twenty-four courses, sixteen of the house of Eleazar, and eight of that of Ithamar; and he ordained that one course should minister to God eight days, from sabbath to sabbath. And thus were the courses distributed by lot, in the presence of David, and Zadok and Abiathar the high priests, and of all the rulers; and that course which came up first was written down as the first, and accordingly the second, and so on to the twenty-fourth; and this partition hath remained to this day. — Josephus, Antiquities of the Jews, Book 7, Chapter 14, Paragraph 7.
King David on God's instructions (1 Chr 28:11-13) had divided the sons of Eleazar and Ithamar, the sons of Aaron, into 24 groups (1 Chr 24:1-4), to setup a schedule by which the Temple of the Lord could be staffed with priests (Kohanim) all year round in an orderly manner. After the 24 groups of priests were established, lots were drawn to determine the sequence in which each group would serve in the Temple. (1 Chr 24: 7-19). That sequence is as follows:
The 24 courses of priests
1 Chr 24:7 1. Jehoiarib 2. Jedaiah
1 Chr 24:8 3. Harim 4. Seorim
1 Chr 24:9 5. Malchijah 6. Mijamin
1 Chr 24:10 7. Hakkoz 8. Abijah
1 Chr 24:11 9. Jeshuah 10. Shecaniah
1 Chr 24:12 11. Eliashib 12. Jakim
1 Chr 24:13 13. Huppah 14. Jeshebeab
1 Chr 24:14 15. Bilgah 16. Immer
1 Chr 24:15 17. Hezir 18. Aphses
1 Chr 24:16 19. Pethahiah 20. Jehezekel
1 Chr 24:17 21. Jachim 22. Gamul
1 Chr 24:18 23. Delaiah 24. Maaziah
1 Chr 24:19 These were the orderings of them in their service to come into the house of the LORD, according to their manner, under Aaron their father, as the LORD God of Israel had commanded him.
Now each one of the 24 "courses" of priests would begin and end their service in the Temple on the Sabbath, a tour of duty being for one week (2 Chr 23:8, 1 Chr 9:25). On three occasions during the year, all the men of Israel were required to travel to Jerusalem for festivals of the Lord, so on those occasions all the priests would be needed in the Temple to accommodate the many sacrifices offered by the crowds. Those three festivals were Unleavened Bread, Pentecost, and Tabernacles (Deut 16:16).
The Yearly Cycle of Service in the Temple.
The Jewish calendar begins in the spring, during the month of Nisan (Est 3:7), so the first "course" of priests, would be that of the family of Jehoiarib, who would serve for the first week of Nisan, Sabbath to Sabbath. The second week would then be the responsibility of the family of Jedaiah. The third week would be the feast of Unleavened Bread, and all priests would be present for service. Then the schedule would resume with the third course of priests, the family of Harim. By this plan, when the 24th course was completed, the general cycle of courses would repeat. This schedule would cover 51 weeks or 357 days, enough for the lunar Jewish calendar (about 354 days). So, in a period of a year, each group of priests would serve in the Temple twice on their scheduled course, in addition to the 3 major festivals, for a total of about five weeks of duty.