Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 255
f these layers. It follows from this that thepath of a ray of light through the atmosphere is not astraight line like A G, but a curve. We may supposethis curve to be represented in Fig. 72, where the num-ber of layers has been taken very small to avoid confusingthe drawing. Let C be the centre and… … FIG. 72.—KEFRACTTON OF LAYERS OF AIR. 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, and S A S^ the refraction, willthrow the star nearer to the zenith Z. The angle S A Z \^ the apparent zenith distance of S;the…
Astronomy
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