He was a Polish mathematician who disagreed with Ptolemy's view that the earth is the center of the universe. The heliocentric theory is the theory that the sun is the center of the universe, not the earth.
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copernicus coined the heliocentric theory...
Copernicus discovered the heliocentric theory in 1510 and worked on it for four more years.
Nicolas Copernicus
Nicolaus Copernicus
anex: developing a heliocentric theory