Nicholas Copernicus
De Revolutionibus Orbium Coelestium
On the Revolutions of the Heavenly Spheres

He put the sun at the center of the Copernican system , in contrast to the the Ptolemaic system

Response of the readers: some liked it, some didn't. The Catholic Church didn't, and placed it on the Index Expurgatorius.

Why? Remember Luther (1517). The church had serious problems and could see new ideas as dangerous.

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Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA