Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 308
tto be the forerunners of wars,pestilence, famine, and otherdire calamities. 289. Visibility of Comets.—Even the brightest comets arevisible only a short time neartheir perihelion passage. Whennear the sun, they sometimesbecome very brilliant, and onrare occasions have been visible,even at mid-day.… … 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 nebula.Such comets can be recognized only by their motion. 282 ASTRONOMY. Thus, in Fig. 322, the upper and…
Astronomy
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