A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 179
ot consist of distinct strata, as represented,but diminishes uniformly in density from the surface of the earth,the broken line a h c P is in reality a curve, and the line S P atangent to it at the point P. 285. The effect of refraction is greatest upon a body. when it is in the horizon, and… … a B c 285. When is the refraction greatest ? When is it nothing? What is its amountat the horizon ? 286. Why is there no refraction at the zenith ? REFRACTION. 177 pendicularly, and refraction only takes place when thedirection of the rajs is oblique ; at the horizon, they aremore oblique than they…
Astronomy
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