= J. C. Hafele
{c}
An experimental researcher who, with <Richard E. Keating>, tested relativistic clock predictions using four portable <atomic clocks> flown around the world. Comparing their readings with a reference timescale after eastward and westward journeys gave different accumulated times. The comparison brought <time dilation> into a transportable laboratory instrument: the prediction depends on both the aircraft’s motion and its altitude through <gravitational time dilation>.<Around-the-World Atomic Clocks: Observed Relativistic Time Gains by J. C. Hafele and others>[Printed pp. 168–170: four cesium clocks, reference comparisons, flight directions and comparison with predictions]{ref}
Back to article page
