A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 609
x of refraction, referred to airAir, like all other gases, changes considerably in density as thepressure and temperature vary (p. 411), and thus, as we ascend fromthe earths surface the index of refraction of the air becomes lessowing to the diminution in density. It follows that the light fromany… … Fig. 534.—Atmospheric refraction. must be directed along this line in order to observe the body. For thisreason the altitude of any heavenly body always appears too great,and the observed altitude HOB must be corrected to obtain the truealtitude. The correction is not easy to calculate, on account…
Physics
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