The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 25
est on the earth,as shown in Fig. 5. This is because distant objects onthe earth appear pro- z jected against theheavens in the di-rection of the hori-zon. The sensible hori-zon is a plane tan-gent to the earthat the point of ob-servation. The ra-tional horizon is aplane parallel withthe sensible… … ASTRONOMY.
Astronomy
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