Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 163
glass. Any of thebright stars, and even the moon, will show such moons ina look-ing-glass. But it a piece of polished metal be used as a mirror, theywill disappear from Mars as well as from the rest. 14 158 ASTRONOMY. the time of the planets opposition. No telescope inthe world will show them when… … Fig. 36.—Map of Mars. straight. They are sometimes fifty miles wide and onethousand long, and their exact nature is a matter ofconjecture. Sometimes they seem to be double, asecond line parallel to the first being noticeable.They make a network over the continents, and some-times seem to disappear.…
Astronomy
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