It gets deeper for me every year, every year you look into it, it will for you too.

Historically, Mary would've known the Julian date of the annunciation and she is reported to have treasured the details. The linked historical data that demonstrate that Simeon had to have been conscious of his references back to Haggai 2 indicate that he found out the conception date too, given that it was, by Mosaic law, known to be Jesus's 40th day. Then the fact that you have multiple streams by which 25 Dec is recalled later, that they are actually free of solstitial influence (the new detail I got recently), and that they are earlier than one would expect from the naysayers suggests that they may contribute to the same testimony strain. When combined with the many lines of evidence indicating Jesus's birth on 6 Oct of 4 BC, there is a very solid historical case here, much more than I realized when first writing the chronology.

I should note, I found a source that demonstrates that Josephus's reference to relatives of Herod who plotted against a king of their own people are solid evidence that the slaughter of the innocents was carried out on Herod's orders by his cousin Joseph. That also came up new this month.