its been shown again and again
Hafele and Keating Experiment
"During October, 1971, four cesium atomic beam clocks were flown on regularly scheduled commercial jet flights around the world twice, once eastward and once westward, to test Einstein's theory of relativity with macroscopic clocks. From the actual flight paths of each trip, the theory predicted that the flying clocks, compared with reference clocks at the U.S. Naval Observatory, should have lost 40+/-23 nanoseconds during the eastward trip and should have gained 275+/-21 nanoseconds during the westward trip ... 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 nanosecond 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."
J.C. Hafele and R. E. Keating, Science 177, 166 (1972)
http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/airtim.html
Object Distance[3] (light years) Perceived Travel Time
Alpha Centauri 4.36 0.43 milliseconds
Galactic nucleus 32,000 3.2 seconds
Andromeda galaxy 2,180,000 3.5 minutes
Virgo cluster 42,000,000 1.15 hours
Quasar 3C273 2,500,000,000 3 days
Edge of universe 17,000,000,000 19 day
http://www.fourmilab.ch/documents/OhMyGodParticle/
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