![]() ![]() ![]() ![]() Very simply, Special Relativity tells us that the moving clocks on satellites seem to us to run slow and General Relativity tells us that the clocks situated ever farther from the surface of the Earth will appear to us to run fast. Without application of these theories, positional accuracies would be measured in kilometres not centimetres. From Hutchinson’s Splendour of the Heavens (1923) where it is credited to E.N.A.The application of Einstein’s theories of special and general relativity are central to the lives of all of us who rely on satellite navigation (GPS). Believed to have been compiled from a composite of two photographs taken at Sobral, it is similar to an illustration that appeared in The Illustrated London News on 22 November 1919. Contemporary graphic showing the deflection of starlight by the sun. ![]()
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