Observations of Mars
- Page 131.
- Johannes Kepler (1571-1630).
- Astronomia Nova seu physica coelestis, tradita commentariis de motibus stellae Martis, ex observationibus g.v. Tychonis Brahe: iussu & sumptibus Rudolphi II. Romanorvm imperatoris &c: plurium annorum pertinaci studio elaborata Pragae, …
- Prague: 1609.
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.