## An elementary treatise on physical astronomy |

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acceleration analytical angle approximate arbitrary quantities argument arising Astron attraction body's centre of gravity centripetal force Chap Clairaut coefficient computed consequently constant correction cosines Dalembert deduced depend determined differential equation diminution direction disturbing body Earth eccentricity effect elements equal Evection expound former formula Hence inclination inequality instance integration inverse Jupiter and Saturn Jupiter's Kepler's Laws Laplace latter longitude Lunar Apogee Lunar Theory mass mean anomaly mean distance mean motion method Moon nearly Newton nodes observation obtained parallax perihelion period Physical Astronomy planets Principia principles progression radius vector Regression represent result retardation revolving satellite secular equation shew Solar Orbit solution square substitute supposed synodic period tangent terms involving terms that involve Thomas Simpson Three Bodies tion tricity Trig true longitude turbing force variation Venus