Geocentric is when people believed that the earth was the center of the universe and everything revolved around it. This theory was embraced by Aristotle and Ptolemy. They thought for hundreds of years that the earth was the center. They thought that every planet revolved around the earth including the sun. They thought this because when they looked up into the sky, they saw that the stars and planets went around the earth.
Heliocentrism is the way we see the universe today in modern society. The Sun stays in the center where the planets revolve around the Sun's orbit. This Hypothesis was created by a Polish mathematician named Nicolaus Copernicus. He noticed that the earth stood still but over the course of the year, he saw different planets going in different directions ( because the earth moves faster than most planets).
The Church did not like how he thought so they put him on trial for false dialouge and the put him on house arrest. Galileo belived in his studies and smarts. and the church belived in the bible
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