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What is the English title of De revolutionibus orbium coelestium libri VI?
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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.
The English title of De revolutionibus orbium coelestium libri VI is "Six Books Concerning the Revolutions of the Heavenly Orbs".123