History of physical astronomy, from the earliest ages to the middle of the 19th century. Comprehending a detailed account of the establishment of the theory of gravitation by Newton, and its development by his successors; with an exposition of the progress of research on all the other subjects of celestial physics (1852)
Grant, Robert, 1814-1892 · London, R. Baldwin · leaf 611
be reduced to such an extent as tobecome ultimately equal to a right angle. In such a case it is manifestthat the more intense the force is, the sooner will the perpendicularity ofthe motion with respect to the radius vector be effected. It has beenremarked that the contrary is true when the… … revolve in au elliptic orbit by the action of a force directed continually toone of the foci. Let a b c d represent the extremities of the axes ofthe ellipse, and let the force tend to the focus s. Let us suppose the body to have been originally at theupper apse a, and to have received animpulse in…
Astronomy
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