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 247
the parallel upon whichthe point in question is situated, and the part of thatparallel which it occupies; for, to know these, is toknow the latitude and longitude of the place. And first of latitude. This may be determined bysimply taking the height of the pole above the horizon;for it is always… … ved 30°, for example, towards the north pole; then,its zenith will be C F; the great circle H O R will beits horizon; the place of the equator, E O Z, will beelongated 30° from the zenith, F, and consequently60° degrees from the horizon. The pole, P, will beelevated 30°, measured by the angle H C…
Astronomy
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