A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 66
made to pass more obliquely, if the medium whichthey enter is rarer, and less obliquely, if it is denser than that whichthey leave. Thus, in passing from air into water, or from water intoglass, the direction would be less oblique ; but in passing from waterinto air, more oblique. Suppose n m to… … b. Now, as the earths atmosphere is not ofuniform density, but grows more and moredense toward the surface of the earth, therays of light which proceed from any body are constantly bent more and more toward a perpendicular direction ;and since we see an object in the direction in which the ray of…
Astronomy
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