Johannes Kepler lived in Graz between 1594 and 1600. In Graz, Kepler began developing an original theory of cosmology based on the Copernican system, which was published in 1596 as Mysterium Cosmographicum — The Sacred Mystery of the Cosmos. Kepler proposed that the distance relationships between the six planets known at that time could be understood in terms of the five Platonic solids, enclosed within a sphere that represented the orbit of Saturn. This book explains Kepler’s cosmological theory, based on the Copernican system, in which the 5 Pythagorean regular polyhedra dictate the structure of the universe and reflect God’s plan through geometry. But — hey — the idea was false.
Later Kepler did some more mathematical thinking and he defined the Laws of Planetary Motion ^[1], one of the biggest break-throughs in science history. But that wasn’t in Graz. Sorry.