feb 13, 1543 - 1543 ACE: Copernicus publishes heliocentric theory
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Nicholaus Copernicus publishes his idea of heliocentrism. This is likely to be independent of Aristarchus. The idea kick-started a shift in public opinion from geocentrism to heliocentrism. Geocentrism is the idea that the earth is at the center of the solar system.
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