THE RELATIVITY OF SPACE-TIME

Many years ago Poincare convincingly demonstrated that space geometry does not have a meaning in itself, but only within the aggregate ''geo metry + measuring instruments.'' Hitherto, this result did not manifes t itself in physical theory, which proceeded along another path and ad mitted solely a dependence of space-time geometry on the matter-energy momentum tenser. In this paper it is shown how the fact, stated by Po incare, can manifest itself in space-time properties of noninertial fr ames of reference.