List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 119
theenvelope, also called the coma, from its resem-blance to hair, and therefore called the brush bythe Chinese, is a sort of atmosphere, of which thetail seems to be an extension. Sonetimes there is nosolid nucleus, but in its stead only a dense massof vapor. The orbits of comets are elliptical,… … (114) COMETS. 11 -3 thousand years. A magnificent one appeared inthe year 1680, which, according to the astronomerEncke, occupies 8800 years in performing one re-volution ; while another, whose orbit was determin-ed by the same astronomer, and which is thereforecalled Enckes Comet, performs its…
Astronomy
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