Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 332
ng planet may be subjectedto the action of a force always perpendicular to the di-rection of its motion, which force may push it from itsnormal path, but cannot affect its elliptical velocity. AS PONDERABLE BODIES. 311 Such a force, then, can have no influence on the lengthof the major axis, or on… … Let P V represent the direction and intensity of anyforce; on this line as a diagonal construct the solidfigure a parallelepiped. Then the sides P P, P P^ andP V will represent the direction and intensity of threeforces, which would produce the same effect as the forceP V. Precisely in this way the…
Astronomy
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