Astronomy in a nutshell, the chief facts and principles explained in popular language for the general reader and for schools (1912)
Serviss, Garrett Putman, 1851-1929, Rouben Mamoulian Collection (Library of Congress) DLC · New York, London, G.P. Putnam's sons · leaf 120
ct to refraction,the amount of bending increasing withapproach to the horizon. Observation showsthat the refraction of the atmosphere, whichis zero at the zenith, increases to about halfa degree (and sometimes much more, depend-ing upon the state of the air), near the THe Atmosphere 85 horizon. It… … Refraction. Suppose an observer situated at O on the earth. The sun,at S, has sunk below the level of his horizon, O H, butsince the sun sends out rays in all directions there willbe some, such as S A B, which will strike the atmosphereat A, and the refraction, tending to make the ray morenearly…
Astronomy
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