Lot Essay
The Harmonices Mundi announced Kepler's third law of planetary motion, relating the magnitudes of the planetary orbits to their periods of revolution round the sun (the first two laws had been announced in Astronomia Nova, 1609). This major treatise on the harmony of the universe represents what Norman has termed "Kepler's attempt to discover God's archetypal model of the universe in the simple mathematical ratios embodied in the five regular polyhedrons, in the laws of musical harmony, in his own theory of astrological aspects, and in the planetary system he had proposed in Mysterium cosmographicum (1596)." It was a remarkable attempt to bring astronomy, geometry, music and astrology into a single unified system.
The Prodromus, first published in 1596, contains Kepler's key "recognition of the fact that there must be a regularity in the movements of the planets and their distances from the sun."
The Prodromus, first published in 1596, contains Kepler's key "recognition of the fact that there must be a regularity in the movements of the planets and their distances from the sun."