Inadequacies in the Current Definition of the Meter and Ramifications Affecting Einstein’s Second Postulate of Relativity

The current definition of the meter as based on time light transmission and postulated universal constant speed is ill-defined inadequate. fails to identify which second required, whether use coordinate or proper time, method construct an exact meter, besides ignoring gravity’s effect. In Einstein’s 1905 paper that defined special relativity, Einstein stipulated correctly traversing ends a resting rod takes equal transmissions in either direction. If oriented parallel velocity, photon from one end moving longer span with overtake receding shorter intercept approaching when transmitted opposite direction, resulting roundtrip distance photons versus rod. Length contraction undercompensates this difference. did not address issue. However, claimed unequal intervals over are because simultaneous states for observer nonsimultaneous observer. This contradicts his first postulate relativity: any state physical system (e.g., timed traverses rod) unaffected by translational velocity between inertial reference frames. An in-depth analysis examines thought experiment adequate redefinition. reveals one-way velocities obey vector addition involving sources, but it proves induction have average identical standard c. Thus, relativity general, valid transmissions. may change many concepts, since particles limited postulate. A suggested redefinition submitted.