Based on the principle of invariance, Einstein's relativity predicts that absolute motion does not exist. Consequently, there should be no difference between a star having a velocity with respect to an observer and an observer having a velocity with respect to a star. In the case of stellar aberration, this prediction appears contrary to observations. It is shown that the description of stellar aberration, in terms of relative transverse velocity between the star and an observer on earth should be corrected, because it is an erroneous interpretation of Einstein's relativity. The exact position where a star appears in the sky does not only depends on the coordinates of the source observed, but also on the observer's relative velocity.
Stellar aberration is a well known phenomenon among astronomers.
It is claimed to be caused by the relative transverse motion between the earth and the star emitting the photons. Radial Velocities . Each component of relative motion between a source and a detector is discussed here separately. There is then no change of direction of the photons. The radial velocity is compatible with the difference of radial velocities between the star and the detector.