Bialas sees it as a very fundamental step away from Aristotelian metaphysical concepts of the soul to that of the theory of forces, and thus a physically based celestial mechanics instead of cosmogonically caused phenomena. Kepler formulated the anima motrix very early, as early as 1600 (documented in correspondence) it changed to the designation virtus motrix " fortune of the mover" or vis motrix "power of the mover" (KGW III, 113). To the extent to which the anima decreases from the sun, the impulse to move ( motus impressio, KGW V, 121) of the heavenly bodies decreases. Kepler is the first to distance himself from the Aristotelian concept of the first mover ( Greek proton kinoun akineton, primum movens ), the primordial ground that flows through all spheres of the cosmos and has the same effect everywhere: it should have given every body a constant angular velocity (Aristotle: De Caelo II.10), which he later refuted with his Lex secunda, and he would have been proportional at the distance from the center of the world have to act, while Kepler needs the quadratic-proportional effect in order to formulate his planetary theory. Kepler expressly says that this connection would be “very clearly the same law for the currents of light and power emerging from the sun” (KGW XIV, 280.653–657). He called this effect vigor motus, the "(life) force of movement". He thought of the relationship between the intensity of the anima motrix and the distance between the sun and the planet as analogous to the decrease in the intensity of light with distance from a light source, whereby the effect of the anima motrix was limited to the orbit of the planets. Kepler described it as a “certain divine power” (KGW I, 56), to which the soul of the heavenly bodies is added, on which the motor anima can act (KGW I, 77), and thus creates the heavenly paths. He called it the anima motrix, "soul of the mover", a concept that goes back to Scaliger's teaching of the moving soul forces, which is still deeply rooted in the impetus teaching of scholasticism. Instead, he speculated that the sun had a radiating, magnet-like effect that fulfills this very task. Kepler did not know the theory of gravity that keeps planets in orbit. The anima motrix is a concept used by the astronomer Johannes Kepler - but not applicable - within the framework of his planetary theory, from which the connections known today as Kepler's laws have been preserved.
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