Contrary to most people of the 14th Century, Copernicus believed that the Earth revolved around the sun. Galileo later proved Copernicus' theory to be correct.
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It was because people that that his calculations were not accurate and also because his calculations of the astronomical positions was not made easy. It was hard to understand
It is different.
Geocentric theory
Geocentric theory
In abstract algebra, group theory studies structures known as groups. Group theory has three historical sources number theory, the theory of algebraic equations, and geometry.