A novel hypothesis concerning motion through the vacuum is presented. The hypothesis relates the complex time exponential of Quantum Mechanics (QM) to absolute motion through a wave medium. The hypothesis is combined with Special Relativity (SR). The two most significant results from this are that this combination produces a term that is consistent with angular momentum and that the direction associated with time is the direction of motion through the vacuum. These relations are presented in Equations 12.0/12.1 and Equation 4 respectively. Equation 12.4 then describes the electron-positron. These are a direct explanation for wave-particle duality and an explanation for the "arrow of time", thereby eliminating time as a fourth dimension. The hypothesis predicts a distinction between the emission and the absorption of energy. The hypothesis requires a tangible wave medium. A variation of the Stern-Gerlach experiment is proposed as empirical verification.