Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 136
re we are supposed to lookdown upon the planetary orbits from the north, and adirection west is, then, that in which the hands of a watchmove, while east is in the opposite direction. When theearth is at H the planet is seen at A. The line H Abeing supposed tangent to the orbit of the planet, it… … Fig. 49. When the earth has reached /the planet is at B, and istherefore near the direction IB. The line has turned in adirection opposite that of the hands of a watch, and cutsthe celestial sphere at a point farther east than the lineHA did. Hence the motion of the planet during thisperiod has…
Astronomy
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