 There is probably no such thing as “Kepler’s philosophy” in any pure form. Nevertheless, many attempts to deal with the “philosophy of Kepler” have been made, all of which are very valuable in their own way. Some studies have concentrated on a particular text (see, for instance, Jardine 1988, for the Defense of Tycho against Ursus), or have followed some particular ideas of Kepler over a longer period of his life and scientific career (see, for instance, Martens 2000, on Kepler’s theory of the archetypes). Others have tried to determine from a philosophical point of view his place in the development of the astronomical revolution from the 15th to the 17th centuries (Koyré 1957 and 1961) or in the more general context of the scientific movement of the 17th century (Hall, 1963 and especially Burtt, 1924). Still others have discussed a long list of philosophical principles operating in Kepler’s scientific world, and have claimed to have found, by means of such an analysis, compelling evidence for the interaction between science, philosophy, and religion (Kozhamthadam, 1994). If, in the particular case of Kepler, philosophy is immediately related to astronomy, mathematics and, finally, “cosmology” (a notion which arises much later), the core of these speculations is to be sought in the spectrum of problems with which he dealt in his Mysterium Cosmographicum and Harmonice Mundi (on this topic, Field 1988 is one of the most representative works on Kepler). In addition, because of the particular circumstances of his life and his fascinating personality and genius, the literature on Kepler is extremely wide-ranging, covering a spectrum from literary pieces like Max Brod’s Tycho Brahes Weg zu Gott (1915)—though still not free from mistakes concerning Kepler—to general introductions in the genre of historical novels, and even fictional stories and charlatanry on astrology or, running for some years now, portraying him as the assassin of Tycho Brahe. However, according to recent reports, it is still a matter of controversy whether Tycho was assassinated at all (see the  report at phys.org).