Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 68
ASTRONOMY. Si its Forward Motion, — If the ball C were fired fast enough toreach the line AD beyond the point D, it would be fartherfrom the surface at the end of the second than when itstarted. Its orbit would no longer be circular, but ellipti- … cal. If the speed of projection were gradually augmented,the orbit would become a more and more elongated ellipse.At a certain rate of projection, the orbit would become aparabola; at a still greater rate,a hyperbola. 51. The Moon held in herOrbit by Gravity. — Newton com-pared the distance m N…
Astronomy
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