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 53
In passing from the right to the left of the line A B,the point, in its progress, will give rise to a series oftriangles, similar to those upon the opposite side. Ineach of these series of triangles the sum of the dis- DEFINITIONS. 51 tanccs of the moving point C, from the two fixed pointsA and B,…
Astronomy
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