Book 20

The cosmology of Johannes Kepler remains a mystery. On the one hand, Kepler’s speculations on spiritual faculties are seen as the remnants of Renaissance philosophy. On the other, his comparison of the cosmos to a clock summons the mechanical metaphor that shaped modern science. This book explores the inseparable connections between Kepler’s vitalistic views and his more enduring accomplishments in astronomy. The key argument is that Kepler’s ‘celestial biology’ served as a bridge between his revolutionary astronomy and other ‘less scientific’ interests, particularly astrology.



Kepler's Cosmological Synthesis sheds new light on one of the foundational figures of the Scientific Revolution. By uncovering a new form of coherence in Kepler’s world picture, it traces the unlikely intersections of mechanism and vitalism that transformed the fabric of the heavens.

Michael Maestlin (1550-1631), professor of mathematics at the University of Tubingen, was a leading protagonist of the astronomical and cosmological revolution that began with Copernicus. Famous for first introducing Copernicanism to Kepler, Maestlin also wrote important treatises on the supernova of 1572 and the comet of 1577 that mark significant steps in the elimination of celestial immutability and the reinforcement of the Copernican worldview. This first critical edition of Maestlin's German manuscript treatise on the comet of 1618 is accompanied by an English translation and a thorough commentary. An extensive introduction situates Maestlin's treatise in the broader context of the contemporary politico-religious conflict and cosmological discussion newly expanded to the debate on sunspots discovered with the telescope.