Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 349
to be indefinitelyprolonged). The section inthis case is an hyperbola, GHK.If the plane of the section beproduced upward, however, itencounters the cone pro-duced, cutting out from ita second hyperbola, GlIK,precisely like the original one, but turned in the opposite direction. The axis of the… … Fig. 102.—The Conies. §440] STELLAR PARALLAX. 337 (c) When the angle made by the cutting plane with theaxis is exactly equal to the cones semi-angle, the plane willbe parallel to the side of the cone, and we then get the specialcase of the parabola, RPO, which forms a partition, so tospeak, between…
Astronomy
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