Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 288
ctto these laws of Kepler ? Of what did he prove that the motion of a planet inany part of its orbit is the result? 513. To what did Newton show that the at-traction is proportional ? Where may we imagine all gravitating energy to beconcentrated ? What did Newton show with regard to the smaller of… … Fig. 306.—The Conic Sections larger. That this orbit will beone of the conic sections—thatis, either a circle, ellipse, hyper-bola, or parabola (see Fig. 106).Which of these it will be, de-pends in each case on the direc-tion and force of the originalimpulse, which, since the move-ments of the…
Astronomy
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