Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 52
D is the horizon,and Z the zenith, of an observerat O. Refraction would makea star at Q appear at P: inother words, it would displaceit towards the zenith. A star inthe zenith is not displaced byrefraction, since the rays which reach the eye from it traversethe atmosphere vertically. The farther a… … 36 ASTRONOMY, half a degree : but it varies considerably with the state ofthe atmosphere. Refraction causes a heavenly bodv to
Astronomy
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