http://theconversation.com/how-einst...-physics-50042
"At the center of Einstein's theories is the fact that the speed of light is independent of the motion of the observer..."
If the speed of light were independent of the motion of the observer, then there would be no reasonable explanation for the fact that the frequency measured by the observer shifts from f=c/λ to f'=(c+v)/λ when the observer starts moving with speed v towards the light source. The only reasonable explanation is this:
The frequency measured by the observer shifts from f=c/λ to f'=(c+v)/λ because the speed of the light relative to the observer shifts from c to c'=c+v.
Pentcho Valev