Abstract

A simple derivation of the general relativistic correction to planetary orbits is given, without explicit reference to Einstein’s field equations. The calculation is compared to Schiff’s investigation of the bending of light. Restrictions on the line element of curved space, which follow from the weak and strong equivalence principles are discussed. The weak equivalence principle and the weak field approximation are exploited to give a simple derivation of the correction to planetary motion in the Brans-Dicke theory.

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