 Kant’s procedure for deriving “true motions” from “apparent motions” does not conceive true motions as taking place in a pre-given absolute space, but views them as the product of an indefinitely extended process of empirical determination taking place within experience itself: we begin from our parochial perspective here on the surface of the earth, proceed (in accordance with the argument of Book 3 of Newton’s Principia) to the center of gravity of the solar system, then proceed to the center of gravity of the Milky Way galaxy, and so on ad  infinitum.[41]