The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 55
36 ASTRONOMY. half a degree ; but it varies considerably with the state ofthe atmosphere. Refraction causes a heavenly body to … Fig. 42. appear above the horizon longer than it really is above it,since it makes it appear to be on the horizon when it isreally half a degree below it.
Astronomy
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