В статье "К электродинамике движущихся тел" Альберт Эйнштейн предлагает свою специальную теорию относительности, которая постулирует, что скорость света в вакууме одинакова для всех наблюдателей и корректирует механику для скоростей, приближающихся к скорости света


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They suggest rather that, as has already been shown to the first order of small quantities, the same laws of electrodynamics and optics will be valid for all frames of reference for which the equations of mechanics hold good. We will raise this conjecture (the purport of which will hereafter be called the “Principle of Relativity”) to the status of a postulate, and also introduce another postulate, which is only apparently irreconcilable with the former, namely, that light is always propagated in empty space with a definite velocity c which is independent of the state of motion of the emitting body. These two postulates suffice for the attainment of a simple and consistent theory of the electrodynamics of moving bodies based on Maxwell's theory for stationary bodies.

On the Electrodynamics of Moving Bodies by Albert Einstein