Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 310
ark cool mass, surrounded by two layers of clouds. The SOLAR SPOTS. 1391 outer layer, which forms the visible photosphere, was supposedextremely brilliant. The inner layer, which could not be seenexcept when a cavity existed in the photosphere, was supposedto be dark. The appearance of the edges of… … Fig. 80.—apparent path of solar spot at different seasons. nucleus of the spot being simply the black surface of the innersphere of the sun itself. This theory, which the figure on the next page exemplifies,accounts for the facts as they were known to Herschel. But whenit is confronted with the…
Astronomy
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