What Caesar actually did was look at the Egyptian calendar and decide that the Roman calendar was kinda shit. As it was, there were a bunch of festival days that the religious authorities could basically put wherever they wanted and fuck up the calendar – and since Caesar was the supreme religious authority, and he had been really busy, he hadn’t had time to put the days in, so the calendar was way out of wack.
So when he got back to Rome he changed the calendar so it was really static. It was basically the rules we have today – 12 months with however many days they have, February does some crazy shit every 4 years, and none of this is open to interpretation. You can’t put the leap day wherever you want, its always at the end of February.
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