Flammarion, Camille, 1842-1925, Welby, Frances A. (Frances Alice) tr · New York, D. Appleton and company · leaf 115
ze that it is by these veryspots that we are enabled to study the physical consti-tution of the Sun. They are generally rounded or oval in shape, andexhibit two distinct parts; first, the central portion, whichis black, and is called the nucleus^ or umbra; second, 95 ASTRONOMY FOR AMATEURS a… … Fig. 29.—Direct photograph of the Sun. surface; but as a matter of fact it radiates a light 2,000times superior in intensity to that of the full moon. Some idea of the aspect of these spots may be ob-tained from the accompanying reproduction of a photo-graph of the Sun (taken September 8, 1898, at…
Astronomy
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