Abstract

The observer's importance as a subject in his or her reference frame, specifically the experience of being at rest in this frame, is pointed to by the discrepency between the experience of centrifugal force and the lack of fundamental significance of this force in Newtonian mechanics. There is nothing that is physical in nature that can serve as the basis for explaining this descrepancy. In addition, the observer's being at rest for himself or herself in a reference frame is a central aspect of both special and general relativity. As a subject, the observer is fundamentally at rest, and this being at rest allows for the measurement of motion in the physical world