I should also point out that beginning the new year on January 1 is arbitrary as well. We could have chosen any day, in any season. We also could have standardized on a lunar new year from one of many cultures that use lunar calendars.
Lastly, we could have instead chosen to standardize on the Sidereal year which differs from the Solar year by 20 minutes, 24.5 seconds, but nevertheless would be another interesting way of operating a calendar!
I should also point out that beginning the new year on January 1 is arbitrary as well. We could have chosen any day, in any season. We also could have standardized on a lunar new year from one of many cultures that use lunar calendars.
Lastly, we could have instead chosen to standardize on the Sidereal year which differs from the Solar year by 20 minutes, 24.5 seconds, but nevertheless would be another interesting way of operating a calendar!