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What the Global Positioning System Tells Us about the Twin?s Paradox

Tom Van Flandern
Year: 2003 Pages: 6
Keywords: GPS, atomic clocks, twin paradox

In the GPS, all atomic clocks in all reference frames (in orbit and on the ground) are set once and stay synchronized. We can use this same trick to place a GPS-type clock aboard the spacecraft of a traveling twin. That clock will stay synchronized with Earth clocks, allowing a clear resolution of the twin?s paradox in special relativity ?why the traveller expects to come back younger, and why the stay-at-home twin is not entitled to the same expectation."