Nicolaus Copernicus was the first astronomer to formulate a comprehensive heliocentric cosmology, which displaced the Earth from the center of the universe. However, Galileo was the first to really champion Copernicus’ heliocentric view, which placed the Sun at the centre of the universe.
Good question, aliviapaul. Nicolaus Copernicus was the first astronomer to propose that instead of everything revolving around the earth(geocentrism), everything revolved around the sun, and that the sun was the center of the universe(heliocentrism). He got the first part right, at least, that the earth and planets did revolve around the sun, except the sun is not the center of the universe, but rather, the center of our solar system.
1st image: public domain
2nd image credit: Niko Lang, and user: booyabazooka, wikipedia
Hope this helps!
Among those famous historic philosphers who believed in an Earth-centered solar system were Aristotle and Ptolemy. This idea stood for nearly 2,000 years.
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