Relativity
The Hafele-Keating experiment was a series of tests conducted in 1971 to measure the effects of time dilation as predicted by the theory of relativity. By synchronizing atomic clocks and flying them around the world on commercial airplanes, the experiment demonstrated that time passes at different rates depending on relative velocity and gravitational potential, supporting Einstein's equivalence principle. This experiment was significant in showing how both special and general relativity influence the passage of time.
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