= Sagnac effect
{wiki=Sagnac_effect}
The Sagnac effect is a phenomenon observed in rotating reference frames and is particularly significant in the study of relativistic physics. It was first demonstrated by French physicist Georges Sagnac in 1913. The effect occurs when a beam of light is split into two beams that travel in opposite directions around a closed path, such as a loop. If the path is rotating relative to an inertial observer, the two beams will take different amounts of time to complete the circuit.
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