A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 76
osphere. So far asthe action is regular, theeffect is to bend the raysdirectly doivnivards, andthus to make the objectsappear higher in the sky.Refraction increases thealtitude of a celestial ob-ject without altering theazimuth. Like parallax,it is zero at the zenithand a maximum at thehorizon ;… … Fig. 35. — Atmospheric Refraction. 90. This approximate law of the refraction is easily proved. Suppose in Fig. 35 that the observer at 0 sees a star in the direction OS,at the zenith distance ZOS or £. The light has reached him from S> by apath which was straight until the ray met the upper…
Astronomy
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