In 1971, Hafele and Keating brought atomic clocks aboard commercial airliners and went around the world, once from east to west and once from west to east. Hafele and Keating observed that there was a...In 1971, Hafele and Keating brought atomic clocks aboard commercial airliners and went around the world, once from east to west and once from west to east. Hafele and Keating observed that there was a discrepancy between the times measured by the traveling clocks and the times measured by similar clocks that stayed at the lab in Washington. The result was that the east-going clock lost 59 ns , while the west going one gained 273 ns. This establishes that time is not universal and absolute.
