Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 285
nd again.in 1909 and 1910. The second of theperiodic comets (in order of discovery) is Enckes, with the shortestperiod known, only 3|- years. Its periodicity was discovered in 1819. §376] COMET GROUPS. 269 Fig. 91 shows the orbits of a number of the short-periodcomets (it would cause confusion to… … Fig. 91. — Orbits of Short-period Comets. Moreover, each comets orbit crosses that of Jupiter near one ojits nodes (the node is marked by a short cross line). The factis extremely significant, showing that these comets at timescome very near to Jupiter, and it points to an almost certainconnection…
Astronomy · Constellations
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