Abstract

In his first major publication, the Mysterium Cosmographicum, Johann Kepler undertook to answer several questions--most notably why there are six planets and why their orbits have a particular relative spacing. Neither Kepler's answers to these questions nor the questions themselves survived the transition to Newtonian physics. Kepler's conviction about the importance of his questions, and his early answers to them, provided the foundation for his subsequent scientific work, including the discovery of the laws of planetary motion for which he is now chiefly remembered. Near the end of his career, in 1621, Kepler produced a second edition of the Mysterium, differing from the first only in the addition of copious notes; in it he refers to his Harmonice Mundi as a vindication of the insights of the Mysterium. J. V. Field's new book systematically examines the mathematical cosmology presented in these three volumes.