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When we say that the speed of light is invariant with respect to all frames of reference, it is as if all frames of reference were the frame of the ether. This is also how Einstein saw it, he thought that there was an ether which was stationary for everyone. So the observer is always at rest and the object observed is in motion. The relativistic Doppler effect is therefore postulated as always produced by the observed object. LTs do not contain any indication of the speed relative to light because they are symmetrical and we cannot distinguish this speed. I gave the calculations. ----------------------------- I can't stop because you really don't understand relativity. You don't even know that the hypothesis of the invariance of the speed of light is a useless hypothesis for the theory, and that it only serves to get rid of the ether. ------------------------------- Time is not physical, so you don't age? Why would the wavelength decrease?