xkcd #3202: Groundhog Day Meaning
Title text:
Originally, the ceremony used a variety of rodents and mustelids, but over time most people agreed it made sense to standardize on a specific individual ground squirrel in Pennsylvania.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3202/
Shepherds only really stay out in their fields during calving season, i.e. And in Israel, that's mid-December to mid-January.
But really, anything actually written about Jesus before the age of like 30, is likely completely made up during the Council of Nicaea in 325AD.
Before that, the Trinity wasn't fully mainstream, because Jesus was considered a created being and not god himself. At least by a large percentage of early Christians.