Christmas, the Solstice, and December 25th

Over the last two posts, I've explained how historical research is showing the date for celebrating Christmas was not chosen because of a Roman holiday like Saturnalia, but how the early church linked the date of Jesus's birth to the date of Jesus's crucifixion. That means Christmas is not a response to a pagan celebration such as Saturnalia but it has Christian roots.

However, Saturnalia is not the only candidate offered by critics as why December 25th was the focus of the coming of the Son of God. There is another holiday that actually occurred on December 25 mentioned in antiquity. This was the Dies Natalis Solis Invictus, translated as is the "Birthday of the Unconquerable Sun." It was celebrated on December 25 in 354 AD according to the calendar of Philocalus.1

The Sol Invictus cult followers worshipped the sun. Thomas Talley reports that while Emperor Aurelian did not first introduce Rome to the cult, he popularized it and the celebration day. Previously, local celebrations of Sol revolved around the dedication of the god's temples in August and/or November. In fact, the word Natalis can mean more than simply birthday, but it may also be used for the concept of an anniversary, as Roger Pearse notes:

There is also the question of what "natalis" means. It could mean birthday; but also it can mean "anniversary of the dedication of a temple". This seems to be the meaning for other "natalis" in the calendar. We know that Aurelian dedicated the temple of Sol Invictus. Thus we would get a festival on the anniversary of the dedication of the temple, and thus the idea that the festival was created at the same time by Aurelian.2

Tally tells us the "indigenous Sun cult at Rome does not seem to have been especially sensitive to the winter solstice or any other quarter days."3 Also, Steven Hijmans declares that while Aurelian set the feast, it may not have been set in December until much later:

there is no evidence that Aurelian instituted a celebration of Sol on that day [December 25]. A feast day for Sol on December 25th is not mentioned until eighty years later, in the Calendar of 354 and, subsequently, in 362 by Julian in his Oration to King Helios.4

The Roman Solstice and Who's Borrowing from Whom?

One mistake we must be careful of is placing too much emphasis on the similar sounding words "sun" and "Son." This is a common misstep for English speakers. While the Latin word for sun is "sol, the word translated son is "filius," breaking any ties to a play on words. Yet, Romans did hold to the idea that December 25 was the "birth of the Sun as the days began to noticeably get longer. Schmidt quotes Macrobius who states it was the Egyptians of the 4th or 5th century that developed the metaphor of the sun coming on the solstice as an infant and growing until the summer, where it would then shrink again as an aging man.5

Of course, all of this is well after the 202 to 211 AD mark where Hippolytus ties December 25 to Jesus's birth. If the Natalis was originally celebrated in August or October or November, why was it changed to December? One possibility is that Aurelian dedicated a new temple on that day and thus they celebrated that dedication as a feast day. Thomas Talley gives us an even more interesting possibility:

Halsberghe, without suggesting that there already was a Christian festival on December 25, presents the probability that one item in Aurelian's religious agenda was the provision of an authentically Roman alternative to the increasingly successful Christian mission.6

Of course, there's much much more, but I think you can see that the charge of Christians chose December 25 in order to "Christianize" or even just appease a pagan populous is weak at best. If you want to dig into more of the history, T.C. Schmidt's series is a great place to start, although it is only available via the internet Archive now. He summarized his findings thus:

• Saturnalia did not occur on December 25 and had nothing to do with the birth of any god or anyone else.
• A feast to Sol Invictus (the Unconquered Sun) did occur on December 25, but the earliest evidence for it dates from the mid to late 4th century. There is no evidence that Emperor Aurelian established a Festival of Sol Invictus (or anyone or anything else) on December 25.
• Egyptians apparently presented an infant as a representation of the newborn Sun on the winter solstice, but this evidence also dates from the fourth and fifth centuries.
• Hippolytus in 202-211 AD set the date for the birth of Jesus on December 25, because he thought Jesus was conceived 9 months earlier on the Passover, the day in which he also thought the world was created (5500 years earlier), the Vernal Equinox March 25.
  
  Clement of Alexandria (193-215 AD) quoted various anonymous sources about the birth of Jesus and roughly agrees with Hippolytus, claiming that Jesus was born in late fall to early winter. Clement's sources clearly seem to believe that Jesus was conceived on the Passover and was born roughly 9 months later; in fact the only difference between them and Hippolytus is that they differed on when the Passover actually occurred. However there is a significant possibility that one of Clement's sources was Hippolytus himself because of the preponderance of possible dates he gives that fall on the 25th of a month (He gives 4 of them and then another date on the 24th) which corresponds with Hippolytus' belief that Jesus was both conceived, born, and executed on the 25th of a month.

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References

1. "Part 6: The Calendar of Philocalus. Inscriptiones Latinae Antiquissimae, Berlin (1893) Pp.256-278." The Chronography of 354 AD. Trans. Roger Pearce. The Tertullian Project, 2006. Web. 18 Dec. 2015. http://www.tertullian.org/fathers/chronography_of_354_06_calendar.htm.
2. Schmidt, T.C., "Antiochus of Athens and the Birth of the Sun-update." Chronicon.net. T.C. Schmidt. 28 Dec 2010. Web. https://web.archive.org/web/20140717194947/http:/chronicon.net/blog/christmas/antiochus-of-athens-and-the-birth-of-the-sun/
3. Talley, Thomas J. The Origins of the Liturgical Year. New York: Pueblo Pub, 1986. Print. 88-89.
4. Hijmans, S. E. Sol: the sun in the art and religions of Rome. 2009 Groningen: s.n. 588 quoted from T.C. Schmidt. "Sol Invictus evidently not a precursor to Christmas." Chronicon.net. T.C. Schmidt. 21 Dec 2010. Web. https://web.archive.org/web/20140717194947/http:/chronicon.net/blog/christmas/sol-invictus-evidently-not-a-precursor-to-christmas/
5. Schmidt, T.C., "Christmas, the Winter Solstice, and the birth of the Sun." Chronicon.net. T.C. Schmidt. 19 Dec 2010. Web. https://web.archive.org/web/20140717194947/http:/chronicon.net/blog/christmas/christmas-the-winter-solstice-and-the-birth-of-the-sun/
6. Talley, 1986. 89.
7. Schmidt, T.C. "Sol Invictus evidently not a precursor to Christmas." Chronicon.net. T.C. Schmidt. 21 Dec 2010. Web. https://web.archive.org/web/20140717194947/http:/chronicon.net/blog/christmas/sol-invictus-evidently-not-a-precursor-to-christmas/