Sommerfeld's and Einstein's Precession of Perihelia

The problem of explaining the precession of the perihelion for planet Mercury has not been solved by any theory, Sommerfeld’s, Newton’s, or Einstein’s. Sommerfeld’s analysis of atomic orbits, so successful in explaining atomic orbits, fails when applied to planetary orbits. Nevertheless, if application of Sommerfeld’s analysis to explaining planetary orbits is correct, one must conclude that planetary orbits do precess by significant amounts which must be accounted for. The orbital speed caus…