The local curvature of the space produced by the Sun causes not only the perihelion precession of Mercurys elliptical orbit, but also the variations of the whole orbit, in comparison with those predicted by the Newtonian theory of gravitation. Calculations show that the gravitational major-axis contraction of the Mercurys elliptical orbit is 1.3 kilometers which can be confirmed by the present astronomical distance measurement technology.
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