That the earth revolves around the sun, not that the sun revolves around the earth.
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He believed in Heliocentrism (That the sun was the centre of the universe, not Earth).
No, that was what the scriptures said, but Copernicus's model, also promoted by Galileo, had the Sun at the centre instead.
The idea that the Earth and plants revolve around the sun was introduced by the astronomer Nicolaus Copernicus in the 16th century. This heliocentric model challenged the prevailing geocentric belief that the Earth was the center of the universe.
Copernicus
Ptolemy and Copernicus' ideas about the universe are different from each other in the sense that Ptolemy thought that every celestial object as well as the sun and the moon orbited the Earth whereas Copernicus had the thought that all planets orbited the Sun, while the Moon orbited the Earth.