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Jan13-12, 10:03 AM
P: 5,632
contant...: By coincidence I just came across this from a book written by a poster here, BenCrowell, and thought you might find it interesting:

In 1971, J.C. Hafele and R.E. Keating of the U.S. Naval Observatory
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 an amount of time tE = -59 +/- 10 ns, while the west-going one gained tW = +273 +/- 7 ns. This establishes that time is not universal and absolute.
more here: