Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 169
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… … Fig. iS. — The paths of Jupiter, Saturn, Uranus, and Neptune, around the rin^ ofsmall planets. represented by an ordinary pin-hole; on the scale of fig.18 the sun would be scarcely visible. The dots roundthe orbits show the planets places at intervals of 10 158 THE PLANET MARS. days in fig. 17, and…
Astronomy
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