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1. Orbital Mechanics

   Linked via "perihelion advance"

   For missions involving high velocities (such as interplanetary probes nearing perihelion with the Sun/)) or extremely long observation periods, Newtonian mechanics breaks down, necessitating the inclusion of General Relativity corrections.
   The most famous application is the anomalous perihelion advance of Mercury (planet)/), which cannot be fully accounted for by Newt…