A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 427
formula for the semi-major axis of an orbit, viz., r I U*a = - - we see that a repulsive force acting from the sun diminishes U (which measuresthe suns attraction), and the consequence is that if the unrepelled particles aredescribing a parabola (in which case C72= V2), then for the repelled… … 414 COMETS. comet rounds the perihelion of its orbit. According to this theory,the tail should be hollow, and in the case of comets when at theirbrightest it usually seems to be so, the centre being darker than theedges. 730. The Central Stripe in a Comets Tail. — Very often, thereis a peculiar…
Astronomy
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