The Reality of Universal Time
The paper proves the mathematical necessity for a new postulate on the velocity of light, if universal time is a reality. This is the universal time postulate on the velocity of light proposed by Moon and Spencer in 1956. Moon, Spencer and Moon developed the general form of this postulate in 1989. The paper then summarizes the recent proofs of the validity of the universal time postulate: stellar aberration based on the astronomical observations of Bradley in 1728 and the current establishment of universal time by the GPS satellite system. Both prove that Einstein's postulate on the velocity of light must be abandoned.