“Why isn’t the new year on winter solstice?”
The answer, honestly, is that the Romans had no fucking idea how to run a calendar.
Like, seriously, people notice "OCTOber" and "DECEMber" and say, "hey, those mean 'eight' and 'ten', but they're the 10th and 12th months, what's up with that?".
If you've got a little more history, you'll know that July and August are named after Julius and Augustus Caesar, and think, "oh, they added those two months and bumped the rest of the months back."
Nope. The Romans were way, way worse at calendars than that.
July and August were actually originally Quintilis and Sextilis - the fifth month and the sixth month. They were called this because the year traditionally started in March. So they had Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, December.
Martius was named for Mars; Junius was named for Juno. We have no idea what Aprilis and Maius were named after. (No, really.) Then they got lazy and just numbered the months.
@noelle Doing some research, anecdotally for Maius:
"From the name Māia, daughter of Atlas and mother of Mercury, probably ultimately from a feminine suffixed form of Proto-Indo-European *méǵh₂s (“great”)."
@devurandom @noelle There's been a lot of proposals to replace the calendar, but frankly the Gregorian is good enough for millennia yet.
@noelle @Elizafox It was the 25th in most of Europe for the Middle Ages (as I said) but also the 15th for a while in the more ancient bits of Rome (as you said): https://en.wikipedia.org/wiki/New_Year#Historical_European_new_year_dates My assumption that the second had carried over to the first was wrong.
@noelle Worth noting (I saw you covered the new year started in March) that it literally started /in/ March. The 15th, in fact.