Well more food for thought for the curious:
If Jesus Christ weren't born on Dec. 25, does the Bible indicate when He was born? The biblical accounts point to the fall of the year as the most likely time of Jesus' birth, based on the conception and birth of John the Baptist.
Since Elizabeth (John's mother) was in her sixth month of pregnancy when Jesus was conceived (Luke 1:24-36), we can determine the approximate time of year Jesus was born if we know when John was born.
24 And after those days his wife Elisabeth conceived, and hid herself five months, saying, 25 Thus hath the Lord dealt with me in the days wherein he looked on me, to take away my reproach among men. 26 And in the sixth month the angel Gabriel was sent from God unto a city of Galilee, named Nazareth, 27 To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary. 28 And the angel came in unto her, and said, Hail, thou that art highly favoured, the Lord is with thee: blessed art thou among women. 29 And when she saw him, she was troubled at his saying, and cast in her mind what manner of salutation this should be. 30 And the angel said unto her, Fear not, Mary: for thou hast found favour with God. 31 And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. 32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: 33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end. 34 Then said Mary unto the angel, How shall this be, seeing I know not a man? 35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God. 36 And, behold, thy cousin Elisabeth, she hath also conceived a son in her old age: and this is the sixth month with her, who was called barren.
John's father, Zacharias, was a priest serving in the Jerusalem temple during the course of Abijah (Luke 1:5). 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.
Historical calculations indicate this course of service corresponded to June 13-19 in that year (The Companion Bible, 1974, Appendix 179, p. 200).
It was during this time of temple service that Zacharias learned that he and his wife, Elizabeth, would have a child (Luke 1:8-13).8 And it came to pass, that while he executed the priest's office before God in the order of his course, 9 According to the custom of the priest's office, his lot was to burn incense when he went into the temple of the Lord. 10 And the whole multitude of the people were praying without at the time of incense. 11 And there appeared unto him an angel of the Lord standing on the right side of the altar of incense. 12 And when Zacharias saw him, he was troubled, and fear fell upon him. 13 But the angel said unto him, Fear not, Zacharias: for thy prayer is heard; and thy wife Elisabeth shall bear thee a son, and thou shalt call his name John.
After he completed his service and traveled home, Elizabeth conceived (verses 23-24).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, and hid herself five months, saying,
Assuming John's conception took place near the end of June, adding nine months brings us to the end of March as the most likely time for John's birth. Adding another six months (the difference in ages between John and Jesus) brings us to the end of September as the likely time of Jesus' birth.