Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 160
ours.His equator makesa somewhat largerangle with his or-bit than the anglebetween our equa-tor and the eclip-tic. And his orbit is more eccentric than the earths, so that the difter-ence between his summer and winter distances from thesun is greater. These two causes make the changesof seasons,… … Fig. 36.—A Telescopic View of Mars. 156 ASTRONOMY. 151. The Satellites of Mars.—Before 1877, Mars wasnot known to have any satellites. At the oppositionwhich occurred that year the planet came very near theearth, and gave an unusually good opportunity of ob-serving him. At that time Prof. Hall1…
Astronomy
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