Question: Why is the Bailey et. al. (1977) muon storage ring experiment not considered a refutation of GR, rather than being a corroboration of SR theory? It seems to establish that only velocity is the cause of time dilation, and the very high acceleration (order of 10^18g) plays no part in time dilation. In the framework of GR, both velocity and acceleration (or at least its equivalent in instantaneous velocity) should cause time dilation. The Bailey experiment seems to validate only velocity time dilation, and disprove gravitational time dilation, in spite of a very high acceleration. (For comparison, GPS satellite time dilation seems to show both velocity and gravitational time dilation. Why not the Bailey experiment?) Any insights on this would be greatly appreciated.