List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 53
es appear to anobserver at the equator ? Where does the pole starappear to an observer at the north pole ? With whatwould the rational horizon coincide to the same observer ? SECTION VII. ATMOSPHERIC REFRACTION. The earth is surrounded by an atmosphere ofvariable density ; the consequence of which… … s e a ray of light, and let the shaded part repre-sent the atmosphere, first supposed to be of uni-form density, and e the place at which the lightenters it; then, instead of going from e to s, itwill be bent into some direction e a, and if a bethe eye of a spectator, the light coming in…
Astronomy
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