Berry, Arthur,b. 1862 · London, J. Murray · leaf 295
fig. 73), and consequently it would hardly be possibleto distinguish the two cases. Newton accordingly workedout the case of motion in a parabola, which is mathemati-cally the simpler, and found that, in the case of a cometwhich had attracted much attention in the winter 1680-1,a parabolic path… … Fig. 73.—An elongated ellipse and a parabola. result. It was thus established that in many cases acomets path is either a parabola or an elongated ellipse,and that a similar result was to be expected in other cases.This reduction to rule of the apparently arbitrary motionsof comets, and their…
Astronomy
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