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 23
ASTRONOMY. … called the horizon. This plane is tangent to the earth atthe point of observation, and extends indefinitely into spacein every direction. In Fig. 4, E represents the earth, O the point of observation, and SNthe horizon. The points onthe celestial sphere directlyabove and below the observerare the…
Astronomy
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