Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 43
er atmospheric effect, for whichit is necessary to make allowance in astronomical observations,is known as Refraction. When a ray of light passes from onemedium into another of different density its direction ischanged. If it passes from a less dense into a denser mediumit is bent towards the… … Fig. 11.—Elementary Theory ofRefraction. the atmosphere homogeneous with a definite upper surface,a ray of light coming from a star, or other body, will, onentering the denser atmosphere, be bent towards the normal,i.e. towards the direction to the zenith. The body will appearto an observer to be…
Astronomy
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