Authors: Ron Bourgoin
Mercury precesses 5600 seconds of arc per century. Newtonian celestial mechanics accounts for only 5557 arc seconds, leaving a discrepancy of 43". In 1859, Urbain Le Verrier, considering all the perturbations in the solar system, wrestled only 35 arc seconds more beyond the 1557". Had he thought about the effect of a spinning sun on Mercury's orbit, he would have gained another 6 arc seconds, for a total of 41", only 2.3% shy of General Relativity's calculation.
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