Mind, Appearance, Copernicus

Kant's allusion to Copernicus appears in the B edition of the Critique of Pure Reason, along with many other revisions, composed subsequent to his development of his theory of Practical Reason.  One significant departure from the A edition is his study of 'self-affection', a process in which Mind actively appears to itself, including examples in which he ascribes motion to appearing Mind.  Thus, it is not only his own earlier concept of Mind that the revision surpasses, but that of Hume's passive observer, as well.  In other words, the context for his allusion to a Copernican spectator is one in which Kant has already presented Mind as an active mobile frame of reference, and, so, as one better illustrated by the Earth rotating on its axis, than by either the immobile Earth of Geocentrism, or the immobile Sun of Heliocentrism.