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Time dilation
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{{Short description|Measured time difference as explained by relativity theory}} {{About|a physical concept|the term used in psychology|Time perception}} {{Special relativity sidebar}} '''Time dilation''' is the difference in elapsed [[Time in physics|time]] as measured by two [[clock]]s, either because of a relative [[velocity]] between them ([[special relativity]]), or a difference in [[gravitational potential]] between their locations ([[general relativity]]). When unspecified, "time dilation" usually refers to the effect due to velocity. The dilation compares "wristwatch" clock readings between [[Event (relativity)|events]] measured in different [[inertial frames]] and is not observed by visual comparison of clocks across moving frames. These predictions of the [[theory of relativity]] have been repeatedly confirmed by experiment, and they are of practical concern, for instance in the operation of [[satellite navigation]] systems such as [[GPS]] and [[Galileo (satellite navigation)|Galileo]].<ref name="Ashby" />
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