Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 282
es only one element of the cone, giving a single straightline; and the last is that in which the intersecting planepasses through the vertex B and cuts both branches of thecone, giving two intersecting straight lines. The character of the conic described depends entirelyupon the central force and… … Fig. 88. — The conicsections. 236 AN INTRODUCTION TO ASTRONOMY [ch. viii, 148 S. If the initial velocity is not too great, it will describe theelUpse E, and 0 will be the aphehon point. If the initialvelocity is just great enough so that the centrifugal acceler-ation balances the attraction, the…
Astronomy
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