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=== General Relativity (GR) ===
GR has the opposite effect. GR predicts that clocks speed up as they get further away from a massive object (the Earth in this case). The effect of gravitational frequency shift on the GPS due to [[general relativity]] is that a clock closer to a massive object will be slower than a clock farther away. Applied to the GPS, the receivers are much closer to Earth than the satellites, causing the GPS clocks in the satellites to be faster by a factor of 5×10<sup>−10</sup>, or about +45.8 μs/day. This gravitational frequency shift is measurable. During early development it was believed that GPS would not be affected by GR effects, but the [[Hafele–Keating experiment]] showed it would be.
The first sentence could be improved by recognizing that GR includes time dilation for relative motion AND gravitational time dilation, the following replacement for the first sentence is suggested;
In addition to time dilation of SR for relative motion GR also includes gravitational Time dilation
=== Combined SR and GR ===
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