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== Relativity ==
The [[theory of relativity]] introduces several effects that need to be taken into account when dealing with precise time measurements. According to [[special relativity]], time passes differently for objects in relative motion. That is known as kinetic [[time dilation]]: in an inertial reference frame, the faster an object moves, the slower its time appears to pass
(as measured by the frame's clocks). [[General relativity]] takes into account also the effects that gravity has on the passage of time. In the context of GPS the most prominent correction introduced by general relativity is [[gravitational time dilation]]: the clocks located deeper in the gravitational potential well (i.e. closer to the attracting body)
[[File:Orbit times.svg|thumb|Satellite clocks are slowed by their orbital speed but sped up by their distance out of the Earth's gravitational well.]]
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