Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 313
uresof 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 lias been very nearly constant duringthe historic period, would in a sun so… … Fig. 81.—^appbaeancb op a spot near the limb aud near the centre of the sun. Number and Periodicity of Solar Spots.—The number of 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…
Astronomy
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