A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 35
the sun is at either of the solstices ? Why? 34. Whatoccurs when the sun is at either cf the equinoxes ? Why ? 82 TWILIGHT. bisects the equinoctial, the suns diurnal arc must every-where be equal to its nocturnal arc. twilight. 25. When the sun is a short distance below the hori-zon, its rays fall… … Let A B C represent three places on the earth, and A H, B II,C H, their horizons respectively. Suppose S to represent the sun,a little below the horizon, its rays passing through the atmospherein S C H; at A, no portion of the visible atmosphere is illumi-nated, and consequently there is no…
Astronomy
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