This addendum provides a rigorous mathematical derivation of Mercury's perihelion precession within the framework of the Quantum-Crystalline (QC) medium. Standard astrophysics attributes the 43 arcseconds per century orbital shift to the geometric curvature of empty spacetime as described by General Relativity. Here, it is demonstrated that this exact precession value emerges deterministically from fluid dynamics. As Mercury approaches the Sun (perihelion), it encounters an exponential gradient of dynamic vacuum viscosity. This localized viscous saturation induces a hydrodynamic delay at the orbital turning point. By integrating the Zolottcev Viscous Stress Tensor into the effective orbital potential, the classical relativistic shift is fully replicated via the physical friction of the QC-medium, further solidifying the unification of gravitational mechanics under hydrodynamics.
Zolottcev et al. (Mon,) studied this question.