A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 129
tail ? From what is the name comet derived ? Appearance of comets ?How distinguished from planets ? 126 COMETS. 202. Comets either revolve around the sun in ellipti-cal orbits, or move in curve lines of other forms. Theelliptic comets may be considered as belonging to thesolar system; the others,… … ORBITS OF COMETS. In the diagram these different kinds of paths are represented.The smaller one is an elliptic orbit of very great eccentricity, Abeing the aphelion, and P the perihelion, a P b and c P d arepaths that do not return into themselves. The former is a curve,called by mathematicians a…
Astronomy
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