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 65
ndby means of his three laws of planetary motion made hisown immortal discovery of the law of gravitation. Thislaw is as follows : Every portion of matter in the universeattracts every other portion, with a force varying directly asthe product of the masses acted upon, and inversely as thesquare of… … ASTRONOMY. 49 according to the angle which the plane of the sectionmakes with the axis of the cone. OPQ, Fig. 58, is a right cone, and ON is its axis.Any section, AB, of this cone, whose plane is perpendicularto the axis of the cone, is a circle. Any section, CD, of this cone, whose plane is…
Astronomy
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