Principle of Motion-Observer Relativity: The axiom stating that motion is constituted by observation. Motion is therefore neither perfectly objective (i.e. fully actual prior to observation) nor perfectly subjective (e.g. a useful fiction, a projection of the mind, a Parmenidean doxa, etc.) The subjective as such is not observed, the objective as such is not constituted by observation.
The axiomatic character of PMOR arises both because it triangulates the scientific waffling between naive realism and Einsteinian-Parmenidean eternalism and because we find it at the confluence of so many diverse physical theories.
1.) Inertial reference/ Equivalence. Both uniform and accelerated motions are equivalent to certain rest states and so stipulating one or the other is relative to the choice of a reference frame, which is the act of the one observing.
2.) Aristotle’s account of time. Time is a sort of counting, and so is found according to diverse logoi in both the subject and the object. But as St. Thomas points out, what he says of time is just as true of motion itself.
3.) The Positivist/ Contemporary Empiricist. There can be no account of any physical quantity apart from the instructions explaining how it is to be measured or observed.
4.) The Idealist. While radical Idealisms are outside the pale here, moderate Idealisms simply want all sense knowledge to involve some contribution from the observer. The “est” in esse est percipi need not be an identity. It can simply give a condition.
5.) Wheeler’s Participatory Universe. Physics makes information possible, information makes observation possible, observation makes physics possible.
6.) Augustinian temporality. Becoming is both a whole in the way any story or song is whole, and yet is incapable of existing with all of its parts. The wholeness of time is from the observer contributing his memory and anticipation to experience.