Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 311
suresof Professor Langley. And a cool solid nucleus beneath such anatmosphere as Herschel supposed would soon become gaseous bythe conduction and radiation of the heat of the photosphere. Thesupply of solar heat, which has been very nearly constant duringthe historic period, would in a sun so… … Fig. 81.—appearance of a spot near the limb and near thecentre of the sun. Number and Periodicity of Solar Spots.—The numberof solar spots which come into view varies from year toyear. Although at first sight this might seem to be whatwe call a purely accidental circumstance, like the occur-rence…
Astronomy
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