That point of a planet's or comet's orbit at which it is farthest from the sun.
单词 | θ231 |
释义 | the world > the universe > heavenly body > movement of heavenly bodies > [noun] > movement in orbit > orbit > parts of orbit (8) aphelion1656 That point of a planet's or comet's orbit at which it is farthest from the sun. perihelion1666 Astronomy. The point in the orbit of a planet, comet, etc., at which it is nearest to the sun. Opposed to aphelion, n. vector1704 Astronomy. (See quot. 1704.) Also vector radius, = radius vector, n., radius, n. 3g. Obsolete. elongation1708 Astronomy. The removal of a planet to its furthest distance from the sun; aphelion. orb1733 Astronomy. The orbit of a planet or other celestial object; (also) the plane of the orbit. Also figurative. Obsolete. periaster1851 = periastron, n. orbitale1901 The lowest point of the inferior margin of the orbit (orbit, n. 1). Lagrangian point1962 each of the five points in the orbital plane of two bodies at which a third body of negligible mass will remain stationary relative to them. |
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