Why the Bradley aberration cannot be used to measure absolute speeds. A   comment
  In a recent article in this journal [G. Sardin, Measure of the absolute speed through the Bradley aberration of light beams on a three-axis frame, Europhys. Lett. 53 (2001) 310], Sardin proposed to use the Bradley aberration of light for the construction of a speedometer capable of measuring absolute speeds. The purpose of this comment is to show that the device would not work. 
Klaus Kassner (Institut fuer Theoretische Physik,   Otto-von-Guericke-Universitaet Magdeburg)