Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 305
wards the Earth, whence it follows that the Sun is asphere. The disk of the Sun is not equally bright over allthe circle of the surface. The centre of the disk is mostbrilliant and the edges are shaded off so as to appear muchless brilliant, as in Fig. 164. The deficiency of brightnessat the edges… … Fig 105.—The Absorption of the Suns Rays is Greater atthe Edges of the Disk than at the Centre. In figure 165 let SE be the Suns radius and SM the radius of hisatmosphere. A person stationed beyond M (to the left hand of thefigure) looking at the Sun along the lines ME and ME would seethe centre of…
Astronomy
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