Quote:
Originally Posted by HarryT
the speed of light in vacuo is, in fact, constant.
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If i remember correctly, Harry and Ralph, the speed of light changes in presence of a gravitational field, obviously associated to mass but not necessarily along the trajectory of the particular portion of the light wave field. So light that passes in the vicinity of the sun follows curved trajectories. This was demonstrated experimentally. Therefore is not in vacuo or not in vacuo the question, but in presence of a gravitational field. But maybe you are both physicists that do not like waves but particles.
