Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 91
g is continually increased as the ray passesfrom stratum to stratum till it finallyreaches the eye of the observer; itspath through the atmosphere is there-fore a curved line, as shown in Fig. 35,and the apparent direction of the bodyfrom which the light comes is that ofthe tangent PE to the curve… … Fig. 35refraction. Atmospheric The strata into which we have supposed the atmosphere to be di-vided are concentric with the surface of the earth, and because theheight of the atmosphere is very small in comparison with the earthsradius, we may, without sensible error, regard the surfaces of the…
Astronomy
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