Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 312
dark cool mass, surrounded by two layers of clouds. The SOLAR SPOTS. 291 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.—appakent path of solas spot at different seasons. nueleua 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 Hebbchel. But whenit is confronted with the…
Astronomy
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