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Circuit :: Circuit (n.) The act of moving or revolving around, or as in a circle or orbit; a revolution; as, the periodical circuit of the earth round the sun..

Eccentricity :: Eccentricity (n.) The ratio of the distance of the center of the orbit of a heavenly body from the center of the body round which it revolves to the semi-transverse axis of the orbit.

Exorbitant :: Exorbitant (a.) Departing from an orbit or usual track; hence, deviating from the usual or due course; going beyond the appointed rules or established limits of right or propriety; excessive; extravagant; enormous; inordinate; as, exorbitant appetites and passions; exorbitant charges, demands, or claims..

Apsis :: Apsis (n.) One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides..

Trajectory :: Trajectory (n.) The curve which a body describes in space, as a planet or comet in its orbit, or stone thrown upward obliquely in the air..

Orbitolites :: Orbitolites (n.) A genus of living Foraminifera, forming broad, thin, circular disks, containing numerous small chambers..

Eccentric :: Eccentric (a.) Deviating or departing from the center, or from the line of a circle; as, an eccentric or elliptical orbit; pertaining to deviation from the center or from true circular motion..

Comet :: Comet (n.) A member of the solar system which usually moves in an elongated orbit, approaching very near to the sun in its perihelion, and receding to a very great distance from it at its aphelion. A comet commonly consists of three parts: the nucleus, the envelope, or coma, and the tail; but one or more of these parts is frequently wanting. See Illustration in Appendix..

Anteorbital :: Anteorbital (a. & n.) Same as Antorbital.

Preorbital :: Preorbital (a.) Situated in front or the orbit.

Elongate :: Elongate (v. i.) To depart to, or be at, a distance; esp., to recede apparently from the sun, as a planet in its orbit..

Orbitosphenoid :: Orbitosphenoid (a.) Of or pertaining to the sphenoid bone and the orbit, or to the orbitosphenoid bone..

Periastron :: Periastron (n.) That point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter..

Syzygy :: Syzygy (n.) The point of an orbit, as of the moon or a planet, at which it is in conjunction or opposition; -- commonly used in the plural..

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

Orrery :: Orrery (n.) An apparatus which illustrates, by the revolution of balls moved by wheelwork, the relative size, periodic motions, positions, orbits, etc., of bodies in the solar system..

Suborder :: Suborbitar (a.) Situated under or below the orbit.

Disorb :: Disorb (v. t.) To throw out of the proper orbit; to unsphere.

Eccentric :: Eccentric (n.) A circle described about the center of an elliptical orbit, with half the major axis for radius..

Anomaly :: Anomaly (n.) The angular distance of a planet from its perihelion, as seen from the sun. This is the true anomaly. The eccentric anomaly is a corresponding angle at the center of the elliptic orbit of the planet. The mean anomaly is what the anomaly would be if the planet's angular motion were uniform..

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