ther the orbit iscircular or more or less elliptical.Let P (Fig. 31) be the posi-tion of a planet, S the sun; andlet the velocity, a, be just suffi-cient to maintain the planet ina circle, if it were at right anglesto 8 P. Now to find the orbit that thisplanet would describe, draw theline P C at… … PLANETARY MOTION. 169 (164.) Now let us suppose that a planet is rather carelessly chap, ii.launched into space, with a velocity neither at right angles tothe sun, nor of sufficient amount to maintain it in a circle, atthat distance from the sun. Fig. 32.
Astronomy
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