Removed the Raychaudhuri equation, but the essence is the same. A rotating flat B4 is essentially an instanton at any given instant from observers inside Minkowski Physical spacetime. (3+1) (I propose we refer to Minkowski spacetime as (4D-1) and the instanton and kinematic space as 4D. Not in the paper though.) v0.997b (This version)- Major rework- the Raychaudhuri equation did not end up working out. I realized I was holding onto it for some reason and so now I have let it go and I feel the entire argument is much more solid overall. I may submit this version to a journal; still need to double check everything. v0.993b -Updated with some better wording and a few better arguments. I show how a lower-dimensional model (tennis ball and flatland appendix) demonstrates how time's hyperbolic orthogonality with space is achieved for a 2D+1D observer living on the surface of a 3D ball through simple rotation. There is a crude animation made in manim for python of the tennis ball example included as tennisball3d.mp4 WIP not yet final v0.997b
Ronald Kyle (2026) studied this question.