The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 100
f to1: in other words, the intensity of the heat of the southern sum-mer will be j^th greater than that of the heat of the northernsummer. 94 TWILIGHT. TWILIGHT. … 101. If the earths atmosphere did not contain particles ofdust and vapor, which serve to reflect the rays of light, thetransition from day to night would be instantaneous, and theintermediate phenomenon of twilight would have no existence. This phenomenon^ is explained in Fig. 41, in whichAB C…
Astronomy
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