Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 307
ents of sMningmatter. The ^penumbra is composed of filaments ofbrigliter and darker light, which are arranged in striae.The appearances of the separate filaments are as if theywere directed downward toward the interior of the spotin an obhque direction. The general aspect of a spot un-der… … Fig. 78.—umbra and penumbra of sun-spot. studied by the Jesuit Scheiner, who supposed them to besmall planets projected against the solar disk. This ideawas disproved by Galileo, whose observations showedthem to belong to the sun itseK, and to move uniformlyacross the solar disk from east to west.…
Astronomy
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