Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 133
earth might revolve around thesun in a circle if it were started with the right velocity.But it is not so easy to understand how it can revolve in anelliptical orbit with the sun at one of the foci. While thematter cannot be fully explained without some rather for-midable mathematical… … Fig. 38. — The earth moves so thatthe line from the sun to the earthsweeps over equal areas in equal inter-vals of time. CH. Ill, 55] THE MOTIONS OP THE EARTH 105 attraction of the sun, it will revolve around the sun in acircle. But suppose the initial velocity is a little greater than thatrequired…
Astronomy
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