Macro-Hydrodynamics: Superposition of Gravitational Fields, Mechanical Resolution of the Equivalence Principle, and the Hydrostatic Nature of Relativistic Effects

Determining the physical nature of gravity remains a primary challenge in classical mechanics.3 This paper proposes a hydrodynamic model of gravity based on the superfluid properties of the4 vacuum (the Substratum). We introduce the principle of “Hydrodynamic Penetration,” which5 demonstrates that gravitational force acts individually on each nucleon rather than on the macro6scopic surface, thereby providing a mechanical resolution to Galileo’s Equivalence Principle. The7 paper challenges the postulate of the universal constancy of light speed (c), arguing instead that8 c represents the wave propagation speed in a medium, which varies with Substratum density (ρ).9 Based on this model, “time dilation” and “length contraction” are derived as mechanical responses10 of matter to motion within the Substratum, without invoking geometric abstractions of spacetime.