Rotation Is Not Absolute

Rotation Is Not Absolute Max Karson November 21, 2025 Abstract Standard physics asserts that while linear velocity is relative, rotation is absolute because it is locally measurable via the Sagnac and Coriolis effects. This paper demonstrates that these phenomena are not indicators of motion, but semantic labels that compartmentalize geometry into Newtonian objects and relativistic effects. Absolute Rotation Privileges a Frame The claim that rotation is absolute [1] presumes that a single geometric object (e.g. “the disk”) exists independently of the observer, and that observers merely occupy different states of motion with respect to it. Relativity forbids this. A “disk” defined in an inertial frame (a closed Euclidean circle with isotropic two-way light speed) transforms operationally to an asymmetric helical geometry for a rotating observer. The usual assertion that the disk “is” Euclidean but “appears” distorted to the rider is circular reasoning that defines the inertial frame as physically fundamental. There Is No Default Geometry The standard arguments for absolute rotation—–Coriolis deflection and the Sagnac effect–—implicitly enforce a default rest geometry, and subsequently label observed differences as the motion of that ”object” through space. While convenient, this convention arbitrarily separates geometry into a foreground object and an empty background, incorrectly defining reality with a partially Newtonian lens. Conclusion Contrary to textbook intuition, an observer in a rotating box cannot determine their ”motion” unless they also are independently supplied with a rest definition of that ”box.” The claim that rotation is locally measurable is thus circular, as the word ”box” compartmentalizes the geometry into an object and a background, which then forces the observer to conclude the box is rotating. Without that external definition, no experiment can reveal both the ”object” and its ”motion.” Rotation gains “absolute” status only by enforcing one frame’s topology (r=r′,t=t′) on all observers, granting them the non-operational ability to measure and compare two geometries at once. 1 AI Disclosure The author used AI language models to assist with drafting, derivations, and algebraic checks. References [1] C. W. Misner, K. S. Thorne, and J. A. Wheeler, Gravitation (W. H. Freeman, 1973), §21.12. 2