The speed of light in a vacuum is a constant of special relativity, electromagnetic\nwave theories, and astrophysical distances. However, several measurements\nof its speed (c ) at locations on the Earthâ??s surface seem to vary at different\ntimes during the last century. Efforts have been made on instruments\nperformance to achieve a unique viable value in any spacetime referential.\nThe time-variability on c -values obtained is here addressed inside the gravity\nfield (g ) in which the measurements of c have been estimated. It appears a\ncorrelation of c and g both daily (tidal) and yearly (no-tidal) variations which\nsuggest that the gravity acceleration control the c -variability everywhere in a\nspacetime referential. Implications of this model provide a sensitivity constant\nof c from g , and the estimates of c on planets of the solar system where g\nvalues are known. It is deduced an upper limit of gravity in black hole that\ncan cancel the speed of light in the horizon.
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