Abstract
New techniques to evaluate the clock effect using light are described. Theseare based on the flatness of the cylindrical surface containing the worldlines of the rays constrained to move on circular trajectories about aspinning mass. The effect of the angular momentum of the source ismanifested in the fact that inertial observers must be replaced by localnon-rotating observers. Starting from this, an exact formula for circulartrajectories is found. Numerical estimates for the Earth environment showthat light would be a better probe than actual clocks to evidence theinfluence of angular momentum. The advantages of light in connection with someprinciple experiments are briefly reviewed.
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