In 1971, Scientists Flew Atomic Clocks Around the World to Test Einstein. He Was Right. #shorts

In October 1971, two scientists — Joseph Hafele and Richard Keating — boarded commercial airliners with cesium atomic clocks. Eastward first. Westward second.
Einstein's relativity predicted the clocks would lose roughly 59 nanoseconds going east, gain roughly 273 nanoseconds going west — because of orbital speed and altitude effects on time itself.
The measurements came back: −59 ± 10 nanoseconds. +273 ± 7 nanoseconds. Einstein was right to the nanosecond.
This is why your GPS works. Every satellite in orbit applies a relativity correction calculated from this 1971 experiment. Without it, GPS would drift by 11 kilometers every day.
Source: Hafele & Keating, Around-the-World Atomic Clocks: Observed Relativistic Time Gains. Science, 14 July 1972.
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