"What is then the physical content of a solution of Einstein's equations..? ...[C]onsider what is actually measured in general relativistic experiments. ...Consider a clock at rest on ...Earth and a clock on a satellite in orbit around the Earth. ...Call T1 and T2 the readings... Each measures the along its own worldline, in the Earth gravitational field. ...the theory predicts the value of T2 that will be associated to each value of T1. Or vice versa."
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Carlo Rovelli
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