Editing Hafele–Keating experiment (section)

===Gravitational time dilation===
{{main|Gravitational time dilation}}
[[General relativity]] predicts an additional effect, in which an increase in gravitational potential due to altitude speeds the clocks up. That is, clocks at higher altitude tick faster than clocks on Earth's surface. This effect has been confirmed in many [[tests of general relativity]], such as the [[Pound–Rebka experiment]] and [[Gravity Probe A]]. In the Hafele–Keating experiment, there was a slight increase in gravitational potential due to altitude that tended to speed the clocks back up. Since the aircraft flew at roughly the same altitude in both directions, this effect was approximately the same for the two planes, but nevertheless it caused a difference in comparison to the clocks on the ground.<ref name="donkoks" />