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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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