Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 38
Fig. 4.—Ellipse. Fig. 5.—Parabola. along, it will mark an ellipse. S and F are called thefoci (fosi). In the orbits of the planets the sun is al-ways at one focus (fokus). If the foci are nearer tothe centre C, the ellipse is nearer circular. The eccen-tricity of an ellipse is the distance CS…
Astronomy
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