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 56
ch thetransverse and conjugate axes,only, are given. To illustratethis, suppose, Fig. 18, A B thegiven transverse axis, and C Dthe given conjugate axis. Then,to describe an ellipse whoseaxes shall be these given lines,/ first, from the centre, F, de-scribe the semicircle A E B.Then apply the length… … 54 DEFINITIONS. die distance between the foci of the ellipse required:in other words, the distance beween the two points atwhich the ends of the thread, whose entire length isA B, are to be confined. The ecliptick is the orbit described, in appearance,by the sun round the earth, but in reality by…
Astronomy
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