It is obvious that the speed of light is NOT independent of the speed of the receiver:
Stationary light source; moving receiver:
http://www.einstein-online.info/imag...ector_blue.gif
(Website:
http://www.einstein-online.info/spotlights/doppler.html)
The speed of the light pulses relative to the source is
c = df
where d is the distance between the pulses and f is the frequency measured by the source. The speed of the pulses relative to the receiver is
c'= df' c
where f' f is the frequency measured by the receiver.
Pentcho Valev