system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How were ancient astronomers able to accurately predict cosmological events using a geocentric model of solar system?
gpt
You don't have to know how something works to recognize patterns in it.

Jupiter takes 12 years to travel the constellations of the Zodiac.  Venus takes 584 days to go from being the morning star to the evening star and back to the morning star again.  If you see an eclipse, you will see a nearly identical eclipse 54 years and 34 days later.

Those numbers check out whether you think the earth goes around the sun, the sun goes around the earth, or the earth is on the back of a giant tortoise and the sun carried by a golden chariot chased by a dragon.