Axis, instantaneous, of rotation method of changing Axis, major of orbits, not affected by secular variations periodical variations of Tage 7 77, 92 87,90 92, 96 251 223, 231 312 permanent change in Barometer, oscillations of 143 motion of the same, as if the masses of the planets were Coefficients of the series expressing the disturbing action of the planets 239 Ellipticity of sun, effects of on the motions of the planets Epoch, defined longitude of, defined 334 of gravity, varies inversely as the square of the distance 168 34 54 70 conservation of 27 6 Gravitation proportional to attracting mass at surface of sun and planets intensity of at the moon. 152 167 356 164 pendulum intensity of on earth, determined by the length of the seconds varies as the square of the sine of the latitude Gyration, centre and radius of Homogeneous spheroid, its compression Įmpetus, definition of, true measure of labour, 48 47 101 477 70 326, 379 326 great inequality of, analytical and numerical motion of nodes and apsides of, chiefly occasioned by the compression of their primary 502 development of the disturbing forces acting on 504 509 tions of the orbits of equations, which give the secular variations in the posi- effects of the precession and nutation of their pri- Kepler's problem of finding the true anomaly of a planet laws satellites obey 152, 159 159 |