اينشتاين : يمكن تفسير حركة النجوم بنظرة بطليموس لها والنتائج سليمه

...Thus we may return to Ptolemy’s point of view of a ‘motionless Earth.’ This would mean that we use a system of reference rigidly fixed to the Earth in which all stars are performing a rotational motion with the same angular velocity around the Earth’s axis…one has to show that the transformed metric can be regarded as produced according to Einstein’s field equations, by distant rotating masses. This has been done by Thirring. He calculated a field due to a rotating, hollow, thick-walled sphere and proved that inside the cavity it behaved as though there were centrifugal and other inertial forces usually attributed to absolute space. Thus from Einstein’s point of view, Ptolemy and Copernicus are equally right. What point of view is chosen is a matter of expediency. (Max Born, Einstein’s Theory of Relativity, 1962, 1965, pp. 344-345.)

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