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When was De revolutionibus orbium coelestium published?
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Nicolaus Copernicus
Portrait of Nicolaus Copernicus, 1580, from the Town Hall in ToruÅ, Poland; in the collection of Muzeum OkrÄgowe w Toruniu (Regional Museum in ToruÅ). In his book De revolutionibus, he proposed that the Sun was the center of the solar system and that the planets circle the Sun.
De revolutionibus orbium coelestium (Six Books Concerning the Revolutions of the Heavenly Orbs) was published in 1543, the same year that Nicolaus Copernicus died.12