Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 257
e one of these layers. It follows from this that thepath of a ray of light through the atmosphere is not astraight line Hke A C^ but a curve. We may supposethis curve to be represented in Fig. 70, where the num-ber of layers has been taken very small to avoid confusingthe drawing. Let C be the… … FIG. 78.—REFRACTION OF LAYERS OP AIB. enters the eye of an observer at A in the apparent direc-tion A S. He will then see the star in the direction Sinstead of that of S S, and *S A S, the refraction, willthrow the star nearer to the zenith Z. The angle S A Z is the apparent zenith distance of…
Astronomy
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