Keplerian Dynamics in the AU–TU–GU Hierarchy: Native Dynamical Constants for Structural Units

The Twin Unit (TU) and Galactic Unit (GU) define interstellar and intergalactic distance as frozen geometric constants [1, 2]. However, a unit system that must convert back to Astronomical Units to perform dynamical calculations has not completed its work. This paper derives native forms of Kepler’s Third Law for the TU and GU scales, each with its own dynamical constant, so that orbital mechanics can be performed entirely within the structural unit hierarchy without reverting to the AU at any stage.