The cartographer Waldseemuller called the Western Hemisphere “America” because he thought it was discovered by Amerigo Vespucci. Once he learned of his error, he couldn’t recall, because it had been disseminated by the printing press.
It’s just about the midpoint between the Winter Solstice and the Vernal Equinox. It’s also when you start to actually notice that the days are getting longer (at least I do).
If there was social media then, we might still be geocentrists. “Truth” is whatever has the most likes.