History of Astronomy Part 3: Copernicus and Heliocentrism

Once it was determined that the Earth is round, the next step was to decipher the geometry of the solar system. Does everything rotate around the Earth, like in the geocentric model of Ptolemy? We thought so for thousands of years, but that all changed when Copernicus came along. He suggested that everything revolves around the sun instead, proposing a new heliocentric model. This was the single biggest paradigm shift in the history of astronomy, and also one of the most significant moments in the history of science. Or even in the history of mankind! Let's check out the details.

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