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 269
ys longer than the nights, at this season. Let us now observe the na-ture of these phenomena inthe equatorial regions, repre-sented by fig. 47. To aninhabitant here, the zenith,O Z, coincides with the equa-torial plane, E e, and the ho-rizor. :h the axis of the poles, P p. Now the sun,whether it be… … the equatorial regions have always days and nights ofequal duration. The polar regions, on thecontrary, fig. 48, have theline of the zenith, O Z, co-inciding with that of thepoles, P p, and their hori-zon, H h, is conloundedwith the equator, E e. Whenthe sun, S, is in the plane ofthe equator, it…
Astronomy
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