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Science 14 July 1972:
Vol. 177. no. 4044, pp. 168 - 170
DOI: 10.1126/science.177.4044.168
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Articles

Around-the-World Atomic Clocks: Observed Relativistic Time Gains

J. C. Hafele 1 and Richard E. Keating 2

1 Department of Physics, Washington University, St. Louis, Missouri 63130
2 Time Service Division, U.S. Naval Observatory, Washington, D.C. 20390

Four cesium beam clocks flown around the world on commercial jet flights during October 1971, once eastward and once westward, recorded directionally dependent time differences which are in good agreement with predictions of conventional relativity theory. Relative to the atomic time scale of the U.S. Naval Observatory, the flying clocks lost 59 ± 10 nanoseconds during the eastward trip and gained 273 ± 7 nanoseconds during the westward trip, where the errors are the corresponding standard deviations. These results provide an unambiguous empirical resolution of the famous clock "paradox" with macroscopic clocks.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Around-the-World Relativistic Sagnac Experiment.
D. W. ALLAN, M. A. WEISS, and N. ASHBY (1985)
Science 228, 69-70
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