Relativity of simultaneity
Concept that distant simultaneity is not absolute, but depends on the observer's reference frame / From Wikipedia, the free encyclopedia
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In physics, the relativity of simultaneity is the concept that distant simultaneity – whether two spatially separated events occur at the same time – is not absolute, but depends on the observer's reference frame. This possibility was raised by mathematician Henri Poincaré in 1900, and thereafter became a central idea in the special theory of relativity.