The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 68
, GH, ofthis cone, whose planemakes with the axis ONan angle less than NOP, is a hyperbola. It will be seen from Fig. 59, m which comparative viewsof the four conic sections art given, that the circle andthe ellipse are closed curves, or curves which return intothemselves. The parabola and the… … 50 ASTRONOMY. and E the earth around which the moon is revolving in thedirection MN. It will be seen that the moon, in moving fromM X.0 N, falls towards the earth a distance equal to mN. Itis kept from falling into the earth by its orbital motion. The fact that abody might be pro-jected forward…
Astronomy
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