2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/9494An earlier paper [1] presented a gravity theory based on the optics of de Broglie waves rather than curved space-time. While the universe's geometry is flat, it agrees with the standard tests of general relativity. A second paper [2] showed that, unlike general relativity, it agrees with Doppler tracking signals from the Pioneer 10 and 11 space probes. There a gravitational acceleration equation plays an important role, accounting for the relative motions of Earth and the probes. Here it's shown that equation also describes Mercury's orbit.6 pages, LaTeX2e, no figuresAstrophysicsGeneral Relativity and Quantum Cosmologytext