Eli5: How did ancient civilizations in 45 B.C. with their ancient technology know that the earth orbits the sun in 365 days and subsequently create a calender around it which included leap years?

Question

Eli5: How did ancient civilizations in 45 B.C. with their ancient technology know that the earth orbits the sun in 365 days and subsequently create a calender around it which included leap years?

In: 6494

Answer 1

If you lived in a world without light pollution the stars would be much more prominent in the sky. And if you live in a world without constant entertainment, you’d be a little bored. I’m sure that after a cycles of cold time warm time you’d start to notice patterns in the days from one warm time to another.