We examine the events leading up to the heresy conviction of Galileo Galilei in 1633 including his dispute with Orazio Grassi regarding the comets of 1618, the publication of The Assayer, the deal with Pope Urban VIII and the publication of the Dialogue Concerning Two Chief World Systems.
Frontispiece and Title page of Galileo's Dialogue
Galileo in Front of the Congregation of the Inquisition
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