Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 264
he sunhas just risen—that is, if its lower edge is just in apparent contact THE EARTH. 243 with the horizon—it is in fact entirely below the true horizon, forthe refraction (35) has elevated its centre by moie than its wholeapparent diameter (32). The moon is full when it is exactly opposite the… … Fig. 153.—Refraction of the Light of a Star by theEarths Atmosphere. Twilight.—It is plain that one effect of refraction is tolengthen the duration of daylight by causing the Sun toappear above the horizon before the time of his geometricalrising and after the time of true sunset. Daylight is also…
Astronomy
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