A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 25
a planets orbit.Fig. 18. … a comets obbit. a. Comets Orbits.—In these respectsthey differ from Comets, which also re-volve around the sun, but in differentdirections, in widely different planes, andin very elongated, or eccentric orbits;that is, elliptical orbits of great eccen-tricity. [See Introduction, Art. 29.] I 7.…
Astronomy
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