Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 307
nts of shiningmatter. The jpenumbra is composed of filaments ofbrighter 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 oblique direction. The general aspect of a spot un-der… … 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 itself, a ad to move uniformlyacross the solar disk from east to west. A spot…
Astronomy
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