Newcomb, Simon, 1835-1909 · New York, H. Holt & company · leaf 188
ASTRONOMY. 170 mosphere is called the incident ray ; after its deflection by the atmos- phere it is called the refracted ray. The difference between these directions is called the astronomical refraction. If a normal is drawn (perpendicular) to the surface of the refracting medium at the point… … Fig. 51.— Refraction. the refraction. An observer at (7 will see the star S as if it were at S'. AS is the apparent direction of the ray coming from the star 8, and S is the apparent place of the star as affected by refraction. This explanation supposes the space above B B^ in the figure to be…
Astronomy
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