Alexander V. EmelyanovIlya A. Emelyanov Bauman Moscow State Technical University (Kaluga Branch), Bazhenov st., 2, Kaluga 248000, RussiaInstitute for Physics and Technology of Tsiolkowsky Kaluga State University, Stepan Razin st., 26, Kaluga 248023, Russia pcwork1@mail.ru International Journal of Fundamental Physical Sciences (IJFPS) 5 1 1-11 March, 2015 2231-8186 https://doi.org/10.14331/ijfps.2015.330080 We analyze ray path in the Sagnac and Michelson-Gale experimental setups and in the Michelson interferometer. Work of rotating interferometers is proved to be in full agreement with the concept of static ether. A theory of Michelson-interferometer work in vacuum and in a gas is developed. Three second-order small factors pointed out in papers by Demjanov and Shamir-Fox are taken into account. The new results are considerably different from conclusions of the mentioned papers. An absolute laboratory velocity of 10 km/s found by Miller is reevaluated to become 236 km/s according to the new formulas. A new theory of the Michelson interferometer fully agrees with the concept of the static ether. It is predicted that in the well-known OPERA experiment, the diurnal plot of the neutrino velocity should have one maximum and one minimum separated by a time interval of 12 hours. Ether, Michelson interferometer, Fresnel effect https://creativecommons.org/licenses/by/4.0/