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Another Bible Study about when Jesus was born
Jesus was born in August/September or September/October 
This information is presented with permission of the author Ingrid A. Wijngaarde-Homoet
Her website: http://www.promiseministry.nl/thema-s/bijbelstudie/124-in-what-month-was-jesus-born.html
Month name-of- month .days...... (Day)...........Feasts...................... Comments
1 Nisan/Abib 30  14 Passover (is beginning of religious year)

15-21 Unleavened bread

1st day of week after Passover: First Fruits
second 12th course ended on 14th Nisan. Then for a week all priests officiate together with the life long appointed High Priest. A course lasted a week, to be specific 8 days: probably beginning to count after the Feast of the Unleavened Bread and then again later in the year. When it was their course the priests stayed in the Priests' quarters in the temple and when their course was over and it was not one of the three High Feasts (Passover/Unleavened Bread, Pentecost, Feast of the Tabernacles) or Yom Kippur they went to their homes.
1 Ziv 29    
3 Sivan 30 8 Shavout (Pentecost) The first course started counting on the 22th of Nissan. Making the first round of the 8th course of Abia to be from 12-19 Sivan, in the 3th month; making John to be born 9 months later, in Adar 1 (12th month) and Jesus 6 months later, in th 5th month Av: Sept/Okt or Aug/Sep when not counting Adar II
4 Tammuz 29    
5 Av 30    
6 Elul 29   the second round of the 8th course of Abia is from 7-14 Elul, in the 6th month. Making John to be born 9 months later in Ziv (2th month) and Jesus 6 months later, in the 8th month Marheshvan: Dec/Jan or Nov/Dec, when not counting Adar II
7 Tishri 30 1 Rosh Hashanah (Trumphets: is beginning of civil year)
10 Yom Kippur
15-21 Sukkot (Tabernacles)
8 Marheshvan 29 ot 30    
9 Kislev 29 of 30    
10 Tevet 29    
11 Shvat 30    
12 Adar I  30    
13 Adar II 29 Leap year, once in very four years  

 1st course begins at 22 Nisan, each lasting 7 days
Reference 1.
  According to the Gospel of Luke, during the reign of king Herod, there was "a certain priest named Zecharias, of the course of Abia", whose wife Elisabeth was also of the priestly family of Aaron. The evangelist states that both the parents were righteous before God, since they were "blameless" in observing the commandments and ordinances of the Lord. When the events related in Luke began, their marriage was still childless, because Elisabeth was barren and they were both very old (Luke 1:5–7).
  The duties at the temple in Jerusalem alternated between each of the family lines that had descended from those appointed by king David (1st Chronicles 24:1–19). [1] Luke states that during the week when it was the duty of Zechariah's family line to serve at "the temple of the Lord", the lot for performing the incense offering had fallen to Zechariah (Luke 1:8–11). The Gospel of Luke states that while Zechariah ministered at the altar of incense, an angel of the Lord appeared and announced to him that his wife would give birth to a son, whom he 
was to name John, and that this son would be the forerunner of the Lord (Luke 1:12–17).
Foot note [1]: So “the priests served 4 weeks per year: 1 week twice a year in courses, and the two week-long feasts, unleavened bread and tabernacles. Pentecost is a one-day observance, which would have come before Zacharias' (the 8th) course began, or at the latest, the 1st day of his course, which was from 12 thru 18 Sivan, or noon on the 19th, if Josephus is correct that courses changed at noon on the sabbaths.
Reference 2.   Josephus Antiquities b.7 ch.14 s.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. He also made twenty-four parts of the tribe of Levi; and when they cast lots, they came up in the same manner for their courses of eight days. He also honored the posterity of Moses, and made them the keepers of the treasures of God, and of the donations which the kings dedicated. He also ordained that all the tribe of Levi, as well as the priests, should serve God night and day, as Moses had enjoined them. 
Reference 3.    Josephus against Apion b.2 sect.8, on "mid-day".
For what I have now said is publicly known, and supported by the testimony of the whole people, and their operations are very manifest; for although there be four courses of the priests, and every one of them have above five thousand men in them, yet do they officiate on certain days only; and when those days are over, other priests succeed in the performance of their sacrifices, and assemble together at mid-day, and receive the keys of the temple, and the vessels by tale, without any thing relating to food or drink being carried into the temple; nay, we are not allowed to offer such things at the altar, excepting what is prepared for the sacrifices.
Reference 4.  Easton's Bible Dictionary (1897)/Zacharias
Zacharias (1.) A priest of the course of Abia, the eighth of the twenty-four courses into which the priests had been originally divided by David (1 Chr. 23:1-19). Only four of these courses or "families" of the priests returned from the Exile (Ezra 2:36-39); but they were then re-distributed under the old designations. The priests served at the temple twice each year, and only for a week each time. Zacharias's time had come for this service. During this period his home would be one of the chambers set apart for the priests on the sides of the temple ground. The offering of incense was one of the most solemn parts of the daily worship of the temple, and lots were drawn each day to determine who should have this great honour, an honour which no priest could enjoy more than once during his lifetime. While Zacharias ministered at the golden altar of incense in the holy place, it was announced to him by the angel Gabriel that his wife Elisabeth, who was also of a priestly family, now stricken in years, would give birth to a son who was to be called John, and that he would be the forerunner of the long-expected Messiah (Luke 1:12-17). As a punishment for his refusing to believe this message, he was struck dumb and "not able to speak until the day that these things should be performed" (20). Nine months passed away, and Elisabeth's child was born, and when in answer to their inquiry Zacharias wrote on a "writing tablet," "His name is John," his mouth was opened, and he praised God (60-79). The child (John the Baptist), thus "born out of due time," "waxed strong in spirit" (1:80).
Reference  5.    Josephus Antiquities b.20 ch.8 s.5:
Now as for the affairs of the Jews, they grew worse and worse continually, for the country was again filled with robbers and impostors, who deluded the multitude. Yet did Felix catch and put to death many of those impostors every day, together with the robbers. He also caught Eleazar, the son of Dineas, who had gotten together a company of robbers; and this he did by treachery; for he gave him assurance that he should suffer no harm, and thereby persuaded him to come to him; but when he came, he bound him, and sent him to Rome. Felix also bore an ill-will to Jonathan, the high priest, because he frequently gave him admonitions about governing the Jewish affairs better than he did, lest he should himself have complaints made of him by the multitude, since he it was who had desired Caesar to send him as procurator of Judea. So Felix contrived a method whereby he might get rid of him, now he was become so continually troublesome to him; for such continual admonitions are grievous to those who are disposed to act unjustly. Wherefore Felix persuaded one of Jonathan's most faithful friends, a citizen of Jerusalem, whose name was Doras, to bring the robbers upon Jonathan, in order to kill him; and this he did by promising to give him a great deal of money for so doing. Doras complied with the proposal, and contrived matters so, that the robbers might murder him after the following manner: Certain of those robbers went up to the city, as if they were going to worship God, while they had daggers under their garments, and by thus mingling themselves among the multitude they slew Jonathan [19] and as this murder was never avenged, the robbers went up with the greatest security at the festivals after this time; and having weapons concealed in like manner as before, and mingling themselves among the multitude, they slew certain of their own enemies, and were subservient to other men for money; and slew others, not only in remote parts of the city, but in the temple itself also; for they had the boldness to murder men there, without thinking of the impiety of which they were guilty. And this seems to me to have been the reason why God, out of his hatred of these men's wickedness, rejected our city; and as for the temple, he no longer esteemed it sufficiently pure for him to inhabit therein, but brought the Romans upon us, and threw a fire upon the city to purge it; and brought upon us, our wives, and children, slavery, as desirous to make us wiser by our calamities.
Foot note [19]: This treacherous and barbarous murder of the good high priest Jonathan, by the contrivance of this wicked procurator, Felix, was the immediate occasion of the ensuing murders by the Sicarii or ruffians, and one great cause of the following horrid cruelties and miseries of the Jewish nation, as Josephus here supposes; whose excellent reflection on the gross wickedness of that nation, as the direct cause of their terrible destruction, is well worthy the attention of every Jewish and of every Christian reader. And since we are soon coming to the catalogue of the Jewish high priests, it may not be amiss, with Reland, to insert this Jonathan among them, and to transcribe his particular catalogue of the last twenty-eight high priests, taken out of Josephus, and begin with Ananelus, who was made High Priest by Herod the Great. See Antiq. B. XV. ch. 2. sect. 4, and the note there.
  1. Ananelus. 
  2. Aristobulus. Jesus, the son of Fabus. 
  3. Simon, the son of Boethus. 
  4. Marthias, the son of Theophiltu. 
  5. Joazar, the son of Boethus. 
  6. Eleazar, the son of Boethus. 
  7. Jesus, the son of Sic. [Annas, or] 
  8. Ananus, the son of Seth. 
  9. Ismael, the son of Fabus. 
10. Eleazar, the son of Ananus. 
11. Simon, the son of Camithus. 
12. Josephus Caiaphas, the son-in-law to Ananus. . . . 
13. Annanus (3 mths)
14. Jonathan, the son of Ananus. 
15. Theophilus, his brother, and son of Ananus. 
16. Simon, the son of Boethus. 
17. Matthias, the brother of Jonathan, and son of Ananus. 
18. Aljoneus. 
19. Josephus, the son of Camydus. 
20. Ananias, the son of Nebedeus. 
21. Jonathas. 
22. Ismael, the son of Fabi. 
23. Joseph Cabi, the son of Simon. 
24. Ananus, the son of Artanus. 
25. Jesus, the son of Damnetas. 
26. Jesus, the son of Gamaliel. 
27. Matthias, the son of Theophilus. 
28. Phannias, the son of Samuel. 
As for Ananus and Joseph Caiaphas, here mentioned about
he middle of this list, they are no other than those Annas and
Caiaphas so often mentioned in the four Gospels; and that 
Ananias, the son of Nebedeus, was that high priest before
whom St. Paul pleaded his own cause, Acts 24.
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