Time Field Theory XVI: Unified Derivation of Cosmic Velocity, Acceleration, Rest Constant and Earth's Gravitational Acceleration

Based on the axiom of total spacetime velocity conservation in Time Field Theory (TFT), we present complete geometric and logical derivations of cosmic velocity, spacetime angle, fine-structure constant α, and universal acceleration within a flat-spacetime framework. The geometric dynamics rigorously yields a universal acceleration formula without free parameters, from which Earth’s surface gravitational acceleration is derived directly. Gravitational acceleration is shown to be the dynamical effect of the time field returning to equilibrium. The fine-structure constant α is the intrinsic minimum tilt angle of the time field in the observable universe. Microscopic constants and macroscopic gravity share a common geometric origin. All mathematical and logical steps are fully presented, consistent with the TFT series and standard theoretical physics.