Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 193
to the time. Thus in Fig. 66, the areas aSb, cSd,and eSf, are all equal; the arcs ab, cd,and ef, being each described in a unit oftime, under the action of a centralforce, always directed towards S. We have already seen that as amatter of fact the earth obeys thislaw in moving around the sun… … Fig. 66. —The Law of Equal Areas. 250. Circular Motion. — In the special case when the path of abody is a circle described under the action of a force directed to itscentre, its velocity is constant. The force, moreover, is constant, andin works upon Mechanics (see Physics, p. 63; but in the…
Astronomy · Constellations
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