This comes from the OT forum, where we have been wondering about the exact origins of the Christmas festivity. We more or less know that it comes from pagan grounds (winter festival). But would love to know when was the current date determined (note that if we are counting the years since the birth of Christ, shouldn't Christmas be at the 1st of Jan?). Also, other christian religions celebrate it in other dates (Orthodoxs in January, IIRC), so would love to known the reason.