This BTN was about Babylonians and Mayans and their astronomy
I learned that the Babylonians made the calendar which is cool. When did Ptolemy think of the polemic system? Did the Babylonians think of the alphabet since they thought of the calendar? The Mayans invented a complex base 20 number system calendar. The Mayans were important as well because of the planet alignment. The Babylonians had a way of recording large amounts of information.