Über die Schwere des Lichtes in der Newtonschen und in der Einsteinschen Gravitationstheorie



The gravity theories of Newton and Einstein are giving opposite sentences about the velocity of light in gravitational field. According to the Newtonian theory the velocity v in gravitational field is greater than the velocity c in a field-free space: v > c. According to general relativity theory we have a smaller velocity: v < c. For a spherical symmetric gravitational field Newton's theory gives equation image but Einstein's theory of 1911 gives equation image and general relativity gives equation image. Therefore, the radarecho-measurations of Shapiro are the experimentum crucis for Einstein's against Newton's theory.