Hi all,
I'm wondering about this - there might (likely?) be something historical in getting to this info since everyone I know plus people on the internet say that Jesus' (real) birthday is on December 25! Thanks a lot!
In the ancient Church a lot of discussion was had on what calendar day Jesus died, and when He was born. There were a variety of opinions, but one of the most prevalent was that in the year Christ died, Nissan 14th occurred on March 25th (the Jewish calendar and the Roman calendar differed year to year, because the Romans used a solar calendar and the Jews a lunar calendar). Many then taking this March 25th as the day of His passion, proposed that since the Lord was perfect, that He had a perfectly round life, thus that He was conceived on the same day that He suffered. Thus if He was conceived on March 25th, then it's a simple adding of nine months to find His day of birth, which would be December 25th. A fourth century treatise on the conception and births of Jesus and John the Baptist mention that Jesus suffered on the same day He was conceived, the kalends of April (which is March 25th). St. Augustine in Book IV, ch. 5 of On the Trinity likewise states the same, and that is why the tradition of His birth on December 25th exists.
And in spite of what some have tried arguing, that Jesus couldn't have been born in the winter, that's just not true.
For one, we can look at the fact that the Gospel of Luke tells us that John the Baptist's father, Zachariah was of the priestly division or course of Abijah; and one of the times in which that priestly course would have been serving in the Temple is in the autumn, October-November. This wasn't the only time of course, as the priestly courses served multiple times a year, twice in rotation, and all serving on each of the High Holy Days. But assuming it was October-November when the angel visited Zachariah, we can count six months, which is when we get the meeting between Mary and Elizabeth. Six months later would have been March or April. And thus, again, nine months later we get December.
It is worth noting that one of the other common days associated with Christ's Nativity was January 6th, which is still in keeping with the above. January 6th is the Feast of the Epiphany (also called Theophany), and for many in the early Church the entire Nativity celebration took place during Epiphany, which is why even today in the Armenian Church January 6th is Christmas. Elsewhere the Nativity and the Epiphany became distinct, but closely associated celebrations. Where in much of the East Epiphany is primarily the celebration of Christ's baptism, in the West the most common aspect of Epiphany is the visitation of the magi, which is why January 6th--Epiphany--is also sometimes called Three Kings Day in the English speaking world (though we have no idea exactly how many magi actually came and visited the Child Jesus, and also that they weren't actually kings).
Was Jesus actually born on a December 25th? It's really impossible to say. But it's not impossible as some would argue; at the same time it's simply not that important. The Feast of the Holy Nativity of our Lord isn't about celebrating Jesus "birthday", i.e. celebrating the anniversary of His calendar birth date; it's about celebrating Jesus' birth--the event itself. It is a liturgical feast, it forms part of the Christian liturgical year, which has its own rhythms and patterns, where every year we as the Christian Church go through the entire Gospel Story. From the hopeful anticipation of Advent, to Christ's birth in Christmas, to His manifestation as King and Christ in Epiphany/Theophany, to His testing and fasting in the wilderness during Lent, to His triumphant entry on Palm Sunday, His Last Supper and betrayal on Maundy Thursday, His passion and death on Good Friday, His glorious resurrection on Easter/Pascha, His ascension on Ascension Sunday, the pouring out of the Holy Spirit on Pentecost, the counting of days during Ordinary Time, and finally we return with hopeful anticipation in Advent.
The year keeps us saturated in the Gospel, it places Christ first and at center in our week-to-week, season-to-season life and worship as His people.
-CryptoLutheran