Funny the first time I see about speed of lights mesure errors was in Walter SHEWART's book "Statistical Method from the Viewpoint of Quality Control" where he shows that even mesures supposed to be very precise are sometimes doubtful and he questioned if the mesure of light was indeed from a Normal Law . Then a notorius Nobel Prize Maurice Allais - who was in fact a theorical Physician but also an Economist and funny he receives his Nobel Prize for Economy - questioned also about the mesures of light http://allais.maurice.free.fr/English/Science.htm: All the scientific work of Maurice Allais relates to the field of the gravitation, the velocity of the light and the anisotropy of space. Maurice Allais, initially, carried out his own experiments which led him to observe the existence of phenomena incompatible with the commonly accepted theories. He drew from them his own conclusions according to which the velocity of the light does not have a constant value but varies (slightly) according to the direction. What led him to show the existence of " ether " and of the anisotropy of space. In a second time and to consolidate his own results, Maurice Allais was brought to reexamine the detail of the results of the experiments which had been carried out in the past on the same subject in the U.S.A. by Michelson and Morley in 1887, by Morley and Miller in 1902, 1904 and 1905, and by Miller in 1925, 1926 and 1930. He then could observe that these results contain the same anomalies which were not noticed at the time by the experimenters or were neglected. Maurice Allais affirms today with force that these anomalies are real and indisputable and that they call into question the general theory of relativity of Einstein.