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 24
Fig. earth. As it cuts the celestial sphere through the cen-tre, it forms a great circle. SN (Fig. 6) representsthe sensible horizon, and S N the rational horizon. ASTRONOMY. … Although these two horizons are really four thousand milesapart, they appear to meet at the distance of the celestialsphere ; a line four thousand miles long at the distance ofthe celestial sphere becom-ing a mere point, far toosmall to be detected withthe most powerful tele-scope. 4. Rotation of…
Astronomy
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