Newton's Principia, sections I, II, III, with notes and illustrations. Also a collection of problems (1863)
Newton, Isaac, Sir, 1642-1727, Frost, Percival, 1817-1898 · Cambridge, London, Macmillan and Co · leaf 195
he orbit. For, in each case, the body may be supposed for a shorttime to be moving in the circle of curvature, and theforces are the same as those which would retain thebody in the circular orbit ; therefore, since the areas described in a given time are equal, the ratio of the forces Observations… … 8 is exterior to the circle, in which case the force is repulsivethrough the arc BC, which is convex to the center of force,and contained between the tangents drawn from S to thecircle. It is important, however, to observe that this problem is to PROP. VII. PROBLEM II. 177 find what would be the…
Mechanics · Celestial mechanics
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