Einstein's relativity is doomed - the speed of light obviously varies with the speed of the observer. Consider a light source emitting a series of pulses the distance between which is d (e.g. d = 300000 km). A stationary observer (receiver) measures the frequency of the pulses to be f = c/d:
http://www.einstein-online.info/imag...ler_static.gif
The observer starts moving with (small) speed v towards the light source - the measured frequency shifts from f = c/d to f' = (c+v)/d:
http://www.einstein-online.info/imag...ector_blue.gif
Question: Why does the frequency shift from f = c/d to f' = (c+v)/d ?
Answer 1 (fatal for Einstein's relativity): Because the speed of the pulses relative to the observer shifts from c to c' = c+v.
Answer 2 (possibly saving Einstein's relativity): Because...
There is no reasonable statement that could become Answer 2.
Pentcho Valev