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 a transpacific microwave link, it is pointed out that Earth´s orbital motion has no influence on these Earthbound wave propagations, while Earth´s rotation does contribute to the Sagnac effect. As the propagation mechanism in the Michelson-Morley experiment cannot be different from that in the aforementioned ones, it is concluded that due to Earth´s rotation, the shift in interference fringes 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 accuracy.