Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 197
nor even an ellipse of slight eccentricitylike the planetary orbits. But it must be a conic. Whetherit will be circle, ellipse, parabola, or hyperbola, depends oncircumstances. For a brief description of these conies, or conic sections andthe way in which they are formed by the cutting of a cone,… … Fig. 67. — The Relation of the Conies to each other. and in it the sum of the distances of any point, N, from thetwo foci equals the major axis; i.e., FN+FN=PA. Thehyperbola does not return into itself, but the two branches PJSP 182 THE PROBLEM OF TWO BODIES. [§ 257 and Pn go off into infinity,…
Astronomy · Constellations
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