Early Astronomy in the University of Michigan Collections

Observations of Mars

This page contains the beginning of chapter 24 (3rd part of the Astronomia Nova), entitled “A clearer proof that the epicycle or annual orb is eccentric with respect to the point of uniformity.” It reaches such a conclusion by recording several days of observations of the planet Mars from March 5, 1590 up to October 26, 1595. As consistently done through this work with the aid of woodcut graphics, Kepler illustrates his own theory by testing it against three previous astronomical systems, those by Ptolemy, Copernicus, and Tycho Brahe.

The New Astronomy

Brahe and Kepler

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