Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 252
numbra of this shadow. What is the cause of alunar eclipse ? Why do we not have lunar eclipses at every fullmoon—once a month ? What is che color of the totally eclipsedmoon ? Why does it have this color ? What is the cause of a solareclipse ? Why do we not have solar eclipses at every new moon… … Fig. 147.—A Schoolroom Experiment to Illustrate aSolar Eclipse.The room must be darkened. The lamp should have a ground glass oran opal globe to represent the circle of the Suns disk. An orange (B)fastened to a pincushion by a knitting-needle may stand for the Earth.A golf-ball suspended by a…
Astronomy
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