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 156
ribed, and therefore must be neglected in the composition of the forces. Observations on the Proposition. 118. The description of an area round a point in motion maybe explained by the following construction for the relative orbit,in the case of motion about a point which is itself moving uniformly… … If PP be drawn equal and parallel to aS, and the sameconstruction be made for every point iu the path of the body,the curve APB, which is the locus of P, is the orbit whichthe body would appear to describe to an observer at $, whorefers all the motion to the body. This is clear, siuce SP is equal…
Mechanics · Celestial mechanics
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