The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 308
htto be the forerunners of wars,pestilence, famine, and otherdire calamities. 289. Visibility of Cofnefs.—Even the brightest comets arevisible only a short time neartheir perihelion passage. Whennear the sun, they sometimesbecome very brilliant, and onrare occasions have been visibleeven at… … Motion and Origin of Comets. 290. Recognition of a Telescopic Comet. — It is impossi-ble to distinguish telescopic comets by their appearancefrom another class of heavenly bodies known as nebulx.Such comets can be recognized only by their motion. 282 ASTRONOMY. Thus, in Fig. 322, the upper and…
Astronomy
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