If the doppler effect is the changing if wavelengths due to movement of a light source (In reference to light of course), does this mean the distance between the wavefront and the source changes at a speed DIFFERENT from C? doesn't this mean that if the observer is in the plane of the source the speed of light for that observer is NOT C? I'm sure I'm missing something, because there's no way the rule of invariable C is shown to be wrong that easily! Especially not by me! haha! Not sure if I made it clear but the source would be moving in the direction of the direction of travel of the wave at any velocity with regards to the plane of the wavefront.