The dependence of modern Physics on the works of Einstein as per his Special and General Relativity is without question, as such works pioneered the explanation of light as a massless particle, the photon, using the Equivalence Principle of inertial and gravitational mass, in the context of describing the then known phenomena of the redshift of light, the Perihelion of Mercury, and the deflection of light around a massive body, together with accounting for four key phenomena, only theorised to exist at the time, namely the gravitational redshift of light, the mass-based frame-dragging of space-time, Black Holes, and Gravitational Waves. This paper measures the success of Einstein’s theoretic devices, and why it seems Relativity Theory has failed to form a suitable bridging understanding between light and mass, between EM and gravity. A solution to the theoretic limitations of Einstein’s Relativity Theory is then proposed in the form of Temporal Calculus.