Abstract

In the field of astronomy, Thomas Hobbes's mechanistic philosophy was influenced by Johannes Kepler. Whereas Galilei still sticks to the circular motion of the planets, Hobbes takes over the Keplerian ellipses. According to Kepler, he defines astronomy as ' celestial physics'. As a consequence, he tries to determine the cause for the planetary motion and the reason why the orbit of the earth is eccentric. Hobbes modifies Kepler's explanation given in the Epitome astronomiae Copernicanae that the earth consists of two parts: one well-disposed, the other hostile towards the sun. Referring to this doctrine, Hobbes developed various astronomical theories throughout a time span of about 35 years in works like "De motu" , De corpore , and the "Decameron physiologicum"