![Frontispiece to Galileo’s Dialogo sopra i due massimi sistemi del mondo, tolemaico e …[Credits : Courtesy of the Joseph Regenstein Library, The University of Chicago]](http://media-2.web.britannica.com/eb-media/53/753-004-ABA3ED97.jpg)
Frontispiece to Galileo’s Dialogo sopra i due massimi sistemi del mondo, tolemaico e copernicano (1632; Dialogue Concerning the Two Chief World Systems, Ptolemaic & Copernican). From left to right are Aristotle, Ptolemy, and Copernicus. Ptolemy holds an astrolabe, Copernicus a model of a planet orbiting the Sun.
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