...From thepoint of view of the importance of finding out the divergence of a cometaryorbit from a parabola, its period, and its aphelion distance, this increase ofrange attains the very highest value... 
George Forbes 「History of Astronomy」
...Hevelius made numerous researches on comets, and suggested that theform of their paths might be a parabola...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...There is a certain beautiful curve known to geometricians by the name ofthe parabola...
Robert Stawell Ball 「The Story of the Heavens」
...It will here be only necessary to point to the connectionwhich exists between the parabola and the ellipse...
Robert Stawell Ball 「The Story of the Heavens」
...It is, in fact, a part of a parabola,which, as we shall see later, is a kind of orbit in whichcomets and some other heavenly bodies move...
George C. Comstock 「A Text-Book of Astronomy」
...A parabola is not so simply defined,and five numbers, called the elements of its orbit, arerequired to fix accurately a comet's path around the sun...
George C. Comstock 「A Text-Book of Astronomy」
...Theexcentricity of its orbit is enormous—in other words, it is either avery elongated ellipse or a parabola...
Oliver Lodge 「Pioneers of Science」
...The comet of 1680, Newton foundto move in an orbit so nearly a parabola that the time of describing itmust be reckoned in hundreds of years at the least...
Oliver Lodge 「Pioneers of Science」
...As a matter of fact the path of a projectile in vacuo is onlyapproximately a parabola...
Oliver Lodge 「Pioneers of Science」
...It is now thoughtpossible that it may not be quite a parabola, but an ellipse soelongated that it will not return till 2255...
Oliver Lodge 「Pioneers of Science」
...It may be a parabola, an ellipsis, spiral, circular, &c...
Paul Henri Thiery (Baron D'Holbach) 「The System of Nature, Volume 1」
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