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 183
discovered that they arenot immoveable, but that they appear to describe,during the time that the earth employs in passinground the ecliptick, those which are in the plane ofthe terrestrial orbit, right lines; those which are inthe plane perpendicular to this orbit, circles; and thosewhich are in…
Astronomy
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