Todd, David P. (David Peck), 1855-1939 · New York, Cincinnati [etc.] American book company · leaf 88
n, is 90°. The quad- rant from the zenith to the south horizon is the measure of its breadth when above the horizon, and the distance from the north horizon to the nadir is its width when below the horizon. Circles of Perpetual Apparition and Perpetual As at the arctic circle, Occultation so here —… … latitude is zero ; and as the Rj^ht sphere (at Equator)
Astronomy
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