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 271
the earth, in other words the radius vec-tor of the sun and earth. This line touches the sur-face of the earth at A. All the points, then, of theearth, situated upon the parallel A B, will have thesun succesively in their zenith, as the rotary motionof the earth brings them, one after another, to… … Spring. northern tropick, and in this position the plane PTSis perpendicular to that of the ecliptick. But, whenthe earth, by virtue of its movement of translation,shall have arrived at the point directly opposite, thatis to say, at T, the radius vector will encounter thesurface of the earth at A,…
Astronomy
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