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propagates at a speed independent of the speed of the source. The motion of the earth through space had no apparent effect on the speed of the light beam, no matter how the platform was turned. The effect had been observed earlier (by
Harress in 1911), but Sagnac was the first to correctly identify the cause.
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In 1913, Georges Sagnac showed that if a beam of light is split and sent in two opposite directions around a closed path on a revolving platform with mirrors on its perimeter, and then the beams are recombined, they will exhibit interference effects. From this result Sagnac concluded that light
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Sagnac was a staunch opponent of the theory of relativity, despite the Sagnac effect being consistent with it.
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in 1911. He showed that such an effect is consistent with stationary ether theories (such as the
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Sur la théorie de la relativité et l'expérience de
Georges Sagnac
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History of special relativity#Experiments by Fizeau and Sagnac
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226:) as well as with Einstein's
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325:Laue, Max von (1911).
276:Journal de Physique IV
176:Wilhelm Conrad Röntgen
111:University of Sorbonne
444:People from Périgueux
300:Zappe, Hans. (2010).
148:ring laser gyroscopes
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397:Theory of Relativity
270:Quintin, M. (1996).
228:theory of relativity
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131:[ʒɔʁʒsaɲak]
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354:: 708–710.
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