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action angle appears arising assumed attraction axes axis becomes bodies cause centre of gravity changes co-ordinates coefficients computed consequently constant contain curve density depending described determined differential direction distance disturbing earth eccentricity ecliptic effect elements epoch equal equation expression fixed fluid force functions give given greater hence inclination increase inequalities integral Jupiter Jupiter's known latitude longitude mass mean motion moon move nearly nodes observation obtained omitted orbit parallax particle periodic planets position preceding principal produce quantities radius ratio regard represented result revolve rotation satellites Saturn secular sine space square substituted supposed surface theory third tion true values variation varies vector velocity whence whole zero