The orbits of comets are ellipses that are greatly elongated or parabolas.
Comets also have their troubles, their perihilions, their hyperbolas and their parabolas.
If, in this approach, they are not disturbed by any of the large planets, they again recede in parabolas or hyperbolas.
The comets have orbits that are usually very elongated ellipses or parabolas.
Nearly three-fourths of this number travel in orbits that appear to be parabolas.
As she advanced, deeply bowing to right and left, parabolas of light exhaled from her coronet like falling stars.
They move in very eccentric orbits—some, perhaps, in parabolas or hyperbolas.
But more than once the parabolas had been stored next to a shed -- and the passing sun set the sheds on fire!
Through four points of which none is at infinity either two or no parabolas may be drawn.
The surface is thus generated by a variable hyperbola moving parallel to itself along the parabolas as directrices.