Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 339
en day and night we call tivttight. It occurs in themorning as well as in the evening. It lasts much longerin summer than in winter. We may properly considerone of the causes of twilight in this chapter; it is reflec-tion. In Eig. 214, E represents the earth. Sunlight comesfrom the right-hand side.… … Fig. 214.—Twilight. of an observer for whom the sun has set, and he is now inthe region of twilight. Clouds and innumerable particlesof moisture and dust floating in the atmosphere above stillcatch the sunlight and reflect it down upon him. In themorning he will enter another such region of…
Physics
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