Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 168
tion shown by the arrows crosses theplane of the earths path from below upwards, while thelatter marks the place where the planet in travelling roundcrosses the plane of the earths path from above down-wards. Fig. 17 shows the paths of the inner family of planetsof which our earth is a member. Fig.… … Fig- T7.—The paths of ^Mercury, Venus, the Earth, and Mars, around the Sun. appear on a very small scale indeed. In fact, thescales appended to the two figures show that a lengthwhich represents 50,000,000 miles in fig. 17, represents THE PLANET MARS. 157 1,000,000,000 miles in fig. i8; or, in…
Astronomy
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