Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 119
will exhibit to the eye. The line A B is called the major axis, and is thelongest line which can be drawn inside the curve. Itpasses from one vortex A to the other vertex at B, and 108 MARS. the semi-ellipse A D B is such that if turned round theaxis A B, it ■\TOuld fall on, and exactly coincide… … The point L is called the center of the ellipse, and di-videsjall the lines drawn through it and terminating inthe curve into two equal parts. But there are twopoints, 0 and 0, called the /oci, which enjoy very pe-culiar properties. If from C as a center, and with aradius equal to A L, the…
Astronomy
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