Galilei Galileo. Diagolo sopra I Due Massimi Sistemi del Mondo, Tolemaico e Copernico. Florence: Gio Batista Landini, 1632. First edition.

Gift of the Friends of the Dallas Public Library, Inc.

In his Dialogue on the Two Chief World Systems, Galileo supports the Copernican theory that the earth is not the center of the universe, but rather one of several planets revolving around the sun. Because of this work, he was imprisoned by the Inquisition and forced to declare publicly that the earth does not move. An apocryphal quotation is attributed to him as he was led from the trial: "And yet, it moves."

 

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