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 80
on of light from the upper layers of the atmos-phere after the sun has ceased to shine on the lower layersat night, or before it has begun to shine on them in themorning. Let A BCD (Fig. 76) represent a portion of the earth,A a point on its surface where the sun S is setting; and letSAN be a ray of… … Fig. 76. solar light, nor any reflected from that part of the atmos-phere which is below A L H; but it receives a twilight fromthe portion HLF, which lies above the visible horizon B F.The point C receives a twilight only from the small portionof the atmosphere HMG; while at D the twilight…
Astronomy
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