Is it true that new years is the aniversary of yushka's bris
closed as off topic by Isaac Moses♦ Mar 7 '11 at 19:48
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Dr. Shnayer Leiman has a fascinating shiur on a related topic (the mysterious "fast of the 9th of Teves"), and one of the points he brings up is the complete unreliability of the December 25 date. It's worth a listen here, at the 33:00 mark.
Well if he was born on Dec 25 then 8 days later on New Years would be the anniversary of his Bris.