Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 289
on, and then from the natureof the case they must be more or less imperfect. Inasmuchas there is little difference in the shape of a parabola and a 284 ASTROKOMY. very elongated ellipse in the neighborhood of their ver-tices, it may happen that many orbits which have beenclassed as parabolas are in… … Fig. 103. Projections of a few Cometary Orbits on the Plane of the Ecliptic. the grouping of those comets with which we are mostfamiliar into classes, each of which corresponds to one ofthe large planets. Thus, the Jovian group contains 12comets whose periodic times range from 5 to 8 years,…
Astronomy
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