The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 310
Fig. 317. part ab, in each case, is tlie portion of the orbit describedby the comet during its visibihty. While describing the dotted … Fig. 318. portions of the orbit, the comet is invisible. Now it is impos 284 ASTRONOMY. sible to distinguish the form of the visible portion in thetwo orbits. The same would be true were one of the orbitsa hyperbola. Whether a comet will describe an ellipse, a parabola, or ahyperbola, can be…
Astronomy
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