Dialogue Concerning the Two Chief World Systems, Ptolemaic and Copernican | 
#OnThisDay in 1632, Galileo published his most influential work, Dialogue Concerning the Two Chief World Systems. The first copy was given to his chief patron Ferdinando II de Medici, Grand Duke of Tuscany. While it was originally published under license from the Vatican, within a year it was entered in the Index of Forbidden Books, where it remained for 203 years. #HistoryGetsLIT
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