This video was mainly about the Mayans, the Babylonians and the ancient Greeks discoveries about our solar system and why they made those discoveries.
The Babylonians created a system of writing to create mathematical models, which could be turned into calendars, which could be used to time important events.
The Babylonians could predict astronomical phenomena. (Stuff happening in space.)
The Mayans could predict the motions of the planets and eclipses.
What would our world be like today if we used a base 20 number system like the Mayans used for their long count calendar?
How was the Ptolemaic system disproved?
From this video, I can tell that ancient civilizations discovered a lot about the stars when they were trying to look at horoscopes.