John Stachel: "But this seems to be nonsense. How can it happen that the speed of light relative to an observer cannot be increased or decreased if that observer moves towards or away from a light beam? Einstein states that he wrestled with this problem over a lengthy period of time, to the point of despair." http://www.aip.org/history/exhibits/...relativity.htm

It can't happen (Einstein wrestled with his conscience, not with the "problem"). If the observer starts moving toward the light source with speed v, the frequency he measures shifts from f=c/d to f'=(c+v)/d, where d is the distance between the light pulses, and accordingly the speed of the pulses relative to him shifts from c=df to c'=df'=c+v, in violation of Einstein’s relativity.

Einstein’s constant-speed-of-light postulate is OBVIOUS NONSENSE.

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