A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 271
so that the cutting plane gets continuallydeeper and deeper into the cone, then the curve is an hyperbola; socalled, because the plane in this case shoots over (v-n-ep fidXXtiv)and intersects the cone produced, cutting out of this second conea curve precisely like the curve cut from the original,… … Fig. 139. — The Conies. VERIFICATION OF GRAVITATION. 259 423. Philosophically speaking there are therefore but two speciesof conic sections, — the ellipse and the hyperbola, with the parabolafor a partition between them. (The circle, as has been said before,is merely a special case of the ellipse.)…
Astronomy
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