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...