Why no one has measured the speed of light

Why no one has measured the speed of light

Physics students learn the speed of light, c, is the same for all inertial observers but no one has ever actually measured it in one direction.

References: Einstein, A. (1905). On the electrodynamics of moving bodies. Annalen der physik, 17(10), 891-921. (English) https://ve42.co/E1905 (German) https://ve42.co/G1905

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