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To date, the most accurate verification of the time effect of gravity is where two satellites were accidentally put into elliptical orbits where the altitude varied by 8,500 kilometers ( 5,282 mi). Their atomic clocks ran slower near Earth and faster at higher altitude. The agreement with GR was within a few thousands of a percent. (see https://www.sciencenews.org/article/satellite-oops-reaffirms-einstein-theory-gravity )