Reinterpretation of the Michelson-Morley experiment based on the GPS Sagnac correction

By examining the effects of rotational and orbital motions of the Earth on wave propagation in the global positioning system and an intercontinental m icrowave link, it is pointed out that the Earth's orbital motion has no inf luence on these earthbound wave propagations, while the Earth's rotation do es contribute to the Sagnac effect. As the propagation mechanism in the Mic helson-Morley experiment cannot be different from that in the aforementione d ones, it is concluded that due to the Earth's rotation, the shift in inte rference fringe in this famous experiment is not exactly zero. However, by virtue of the round-trip propagation path, this shift becomes second order and hence is too small to observe within the present precision.