Moving Signals and Their Measured Frequencies
  Classical Doppler Effect of light propagation can be calculated by making any one of the two assumptions a) Light propagates at the speed c with respect to the source or b) Light propagates at the speed c with respect to the receptor. We show that the ratio of the two calculated classical Doppler Effects, with propagation speed c in the source inertial frame and receptor inertial frame respectively, remains constant equaling [1-(v^2/c^2)] : 1 , in all orientations (longitudinal, transverse and any arbitrary angle). Furthermore, we show that the Doppler Effect as predicted by special relativity, is in each and every orientation, the geometric mean of the two expected classical Doppler Effects. This leads to two contradicting conclusions: (1) by the receptor that the clock associated with the emitter runs slow, and (2) by the emitter that the clock associated with the receptor runs slow. These differences can be resolved if we theorize that light travels at speed c with respect to the emitter as it leaves the emitter and travels at speed c with respect to the receptor as it approaches the receptor. The postulation that light travels at speed c with respect to material objects in the vicinity of those material objects will resolve all paradoxes related to reciprocal time dilation. 
Chandru Iyer, G.M.Prabhu
physics.gen-ph