The Hafele-Keating experiment was a groundbreaking test conducted in 1971 that aimed to measure the effects of time dilation predicted by Einstein's theory of relativity. This experiment involved flying atomic clocks around the world on commercial airliners to compare their elapsed time with identical clocks that remained stationary on the ground. The findings provided strong evidence supporting the concepts of relativity, particularly in the context of precision spectroscopy and the determination of fundamental constants.
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