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A Review of The Principle Shortly before his death in 1543, Nicolaus Copernicus published De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres) in which he proposed that the motion of the planets could be better explained by assuming that the sun, rather than the earth, sits at the center of the universe (the Solar System being the extent of the known universe of his day). Up until this point,… Read More