Gauge symmetry plays a central role in modern field theory, yet its physical origin remains conceptually unclear. In this work, we propose a realist reinterpretation of U(1) gauge symmetry based on the internal phase dynamics of the electron. According to the 0-Sphere model, the electron possesses a deterministic internal oscillation between two thermal energy kernels. This internal structure generates a periodic phase evolution, which naturally leads to the emergence of a geometric U(1) gauge connection. The model predicts a specific internal oscillation velocity, approximately 4 percent of the speed of light, derived from relativistic dynamics. Gauge potentials are reinterpreted not as formal artifacts, but as synchronization mechanisms for the internal clocks of phase-bearing particles. This framework unifies gauge interaction and spin structure through a common time-based geometry, offering a particle-centric alternative to conventional field-based gauge theory.