The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 65
placed against the string, and carried around, as shown inthe figure. The curve described by the pencil is an ellipse.The two points -F and E are the foci of the ellipse : thesum of the distances of these two points from every pointon the curve is equal to the length of the string. Whenhalf of the… … centre of the ellipse ; A A is the major axis of the ellipse,and CD is the minor axis. 43- The Eccentricity of the Ellipse. — The ratio of thedistance between the two foci to the major axis of theellipse is called the eccentricity of the ellipse. The greater the distance between the twofoci,…
Astronomy
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