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" Comets, being impell'd towards the Sun by a centripetal Force, would descend as from Spaces infinitely distant; and, by their so falling, acquire such a Velocity, as that they may again fly off into the remotest Parts of the Universe, moving upwards with... "
A Complete System of Astronomy - Page 416
by Samuel Vince - 1814
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The Elements of Astronomy, Physical and Geometrical, Volume 2

David Gregory - 1715 - 566 pages
...tendency, fo as never to return again to the Sun. But fince they appear frequently enough, and finee none of them can be found to move with an Hyperbolic Motion, or a Motion fwifter than what a Comet might acquire by its Gravity to the Sun, 'tis highly probable they rather...
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The Elements of Astronomy: Designed for the Use of Students in the University

Samuel Vince - 1811 - 260 pages
...infinitely distant, and, by their so falling, acquire such a velocity, as that they may again fly off into the remotest parts of the universe, moving upwards...enough, and since none of them can be found to move with a hyperbolic motion, or a motion swifter than what a comet might acquire by its gravity to the sun,...
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The Principles of Hydrostatics: Designed for the Use of Students in the ...

Samuel Vince - 1820 - 472 pages
...again fly off into the remotest parts of the universe, moving upwards with a perpetual tendency,,so as never to return again to the sun. But since they...motion swifter than what a comet might acquire by it's gravity to the sun, it is highly probable they rather move in very excentric elliptic orbits,...
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The Norwich magazine

1835 - 404 pages
...comets be exactly parabolic, they will " acquire such a velocity, as that they may again fly off into the remotest parts of the universe, moving upwards...tendency, so as never to return again to the sun." The passage just quoted from Mr. Ivory's paper admits, also, that " the nicest observations do not...
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