Astronomy for schools; upon the basis of Mons. Arago's lectures at the Royal observatory of Paris .. (1841)
Arago, F. (François), 1786-1853, Haskins, Roswell William, [from old catalog] ed · New York, Robinson, Pratt & co.; · leaf 77
grees. The pole, P, will beelevated thirty degrees, measured by the angle H C P,and the pole P will be abased, by an equal quantity,below this plane. It follows, from this demonstration,that the distance from the zenith to the equinoctial, orthe latitude, is always equal to the height of the pole… … In following the course of the stars of the sphere wehave seen them all successively elevate themselvesabove the horizon and subsequently sink below it. Atwhat point, then, do the stars cease to ascend? andhow shall we determine, accurately, that point? Thereare several methods which conduct to…
Astronomy
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