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 184
s theyappear in a powerful diffraction spectroscope. 163. The Telluric Lines.—There are many lines of thesolar spectrum which vary considerably in intensity as thesun passes from the horizon to the meridian, being mostintense when the sun is nearest the horizon, and when hisrays are obliged to pass… … when a candle or other artificial light is examined with aspectroscope through a long tube filled with steam. Sincethese lines are due to the absorption of our own atmos-phere, they are called telluric lines. A map of these linesis shown in Fig. 182. 164. The Solar Lines. — After deducting the…
Astronomy
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