Flammarion, Camille, 1842-1925, Welby, Frances A. (Frances Alice) tr · New York, D. Appleton and company · leaf 201
htly acceleratedits course, while in 1759 it retarded it. 181 ASTRONOMY FOR AMATEURS The comets thus follow a very elongated orbit, eitherelliptic, turning round the Sun, or parabolic, dashingout into space. In the first case, they are periodic(Fig. 52), and their return can be calculated. In… … Fig. 52.—The orbit of a Periodic Comet. of 2, that is to say by 1.414. Thus at the distance ofthe Earth from the Sun this velocity = 29,500 meters(18 miles) per second, multiplied by the above number,that is, 41,700 meters (over 25 miles). At the distanceof Mercury it = 47 X 1.414 or 66,400 meters…
Astronomy
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