## Gravitation: An Elementary Explanation of the Principal Perturbations in the Solar System (Google eBook) |

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alteration angle apogee apojove apses passes apses progresses apses to regress B1 to B2 B2 to B3 causes the line central body centre consequently curvature curve depending described diminished disturbing body disturbing force ceases disturbing force directed disturbing force perpendicular disturbing planet earth and sun effect elliptic orbit equal equator exactly excen excentricity fundamental plane greater inclination inequality instantaneous ellipse joining the earth Jupiter latus rectum less line of apses line of conjunction line of nodes longitude major axis mean anomaly mean distance moon moves moon's distance moon's orbit moves from B2 nearly old orbit opposite perigee perihelion to aphelion perijove periodic perturbation plane of reference planet is moving points of conjunction position produced proportion quadratures radius vector retards the moon revolution revolving body revolving round round the sun Saturn second satellite sensibly sun's attraction sun's distance syzygies third satellite tion tricity true anomaly turbing force