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Libration Point :: Libration point (n.) any one of five points in the plane of a system of two large astronomical bodies orbiting each other, as the Earth-moon system, where the gravitational pull of the two bodies on an object are approximately equal, and in opposite directions. A solid object moving in the same velocity and direction as such a libration point will remain in gravitational equilibrium with the two bodies of the system and not fall toward either body..

Hemihedral :: Hemihedral (a.) Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron..

Aphelion :: Aphelion (n.) That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion..

Footstep :: Footstep (n.) An inclined plane under a hand printing press.

Shoot :: Shoot (v. i.) To plane straight; to fit by planing.

Trace :: Trace (v. t.) The intersection of a plane of projection, or an original plane, with a coordinate plane..

Sycamore :: Sycamore (n.) The American plane tree, or buttonwood..

Eccentric :: Eccentric (n.) In the Ptolemaic system, the supposed circular orbit of a planet about the earth, but with the earth not in its center..

Plane :: Plane (a.) To efface or remove.

Plane :: Plane (a.) A surface, real or imaginary, in which, if any two points are taken, the straight line which joins them lies wholly in that surface; or a surface, any section of which by a like surface is a straight line; a surface without curvature..

Slope :: Slope (v. i.) To take an oblique direction; to be at an angle with the plane of the horizon; to incline; as, the ground slopes..

Octant :: Octant (n.) One of the eight parts into which a space is divided by three coordinate planes.

Periodical :: Periodical (a.) Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun..

Time-table :: Time-table (n.) A plane surface divided in one direction with lines representing hours and minutes, and in the other with lines representing miles, and having diagonals (usually movable strings) representing the speed and position of various trains..

Equator :: Equator (n.) The great circle of the celestial sphere, coincident with the plane of the earth's equator; -- so called because when the sun is in it, the days and nights are of equal length; hence called also the equinoctial, and on maps, globes, etc., the equinoctial line..

Venus :: Venus (n.) One of the planets, the second in order from the sun, its orbit lying between that of Mercury and that of the Earth, at a mean distance from the sun of about 67,000,000 miles. Its diameter is 7,700 miles, and its sidereal period 224.7 days. As the morning star, it was called by the ancients Lucifer; as the evening star, Hesperus..

Trapezoid :: Trapezoid (n.) A plane four-sided figure, having two sides parallel to each other..

Plane Tree :: Plane tree () Same as 1st Plane.

Aberration :: Aberration (n.) A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer; called annual aberration, when the observer's motion is that of the earth in its orbit, and daily or diurnal aberration, when of the earth on its axis; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet re

Occultation :: Occultation (n.) The hiding of a heavenly body from sight by the intervention of some other of the heavenly bodies; -- applied especially to eclipses of stars and planets by the moon, and to the eclipses of satellites of planets by their primaries..

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