Einstein's bias blind spot: It is evident that the longitudinal Doppler effect contradicts the constancy of the velocity of light c in reference frames

Abstract  The physical mystery behind the constancy of the velocity of light is solved after the bias blind spot of Einstein's relativistic physics was illuminated precisely. We have given the physical law f = c/λ. The relative frequency shifts of the longitudinal Doppler effect are calculated from the frequency ratio of the frequency f r at the receiver and the frequency f e at the emitter. The very small frequency shift of the so-called relativistic time dilation factor can be neglected for low velocities. Comparing electromagnetic radiation, when receiver and emitter are at rest, the wavelengths must be the same and are canceling, so that we obtain: f r/f e = (c/λ r)/c/λ e) = c/c = 1/1. If the relative velocity c of light were constant in any inertial frame, independent of the motion of the receiver and emitter, no shift of wavelength and frequency would be possible. Einstein's special relativity excludes the possibility of the longitudinal Doppler effect. The longitudinal Doppler effect is explained according to relativity in dependence of gravity (RG), by which Einstein's illogical relativity is replaced. Why do we always measure the constant velocity c on Earth is now physically understandable.