Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 309
nts of shiningmatter. The penumbra is composed of filaments ofbrighter and darker light, which are an-anged in striae.The appearances of the separate filaments are as if theywere directed downward toward the interior of the spotin an oblique direction. The general aspect of a spot un-der… … Fig. 78.—uxibra and penumbra of sun-spot. studied by the Jesuit Scheinee, who supposed them to besmall planets projected against the solar disk. This ideawas disproved by Galileo, whose observations showedthem to belong to the sun itself, and to move uniformlyacross the solar disk from east to…
Astronomy
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