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You have a very understandable misconception of how ring laser gyroscopes work. The use of the word gyroscope in the name is a bit of a misnomer. In a basic ring laser gyro there are no moving parts (the laser beam excepted, of course).Shahin.Omar said:"Sagnac effect and ring laser gyros", I have not understood it very clearly, however if you rotate the gyros around stationary Earth's orbit, or you rotate the source of light around stationary Earth's orbit, in one of which situations, different from the original situation you will get the same result? And is not the use of source of light akin to using external reference point, given that I have not understood it very clearly, sorry
BTW, this doesn't make a bit of sense: "stationary Earth's orbit". If the Earth is stationary it isn't moving; it has no orbit.