Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 53
36 ASTRONOMY, half a degree : but it varies considerably with the state ofthe atmosphere. Refraction causes a heavenly bodv 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 isreallv half a degree below it.
Astronomy
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