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Moon :: Moon (n.) The celestial orb which revolves round the earth; the satellite of the earth; a secondary planet, whose light, borrowed from the sun, is reflected to the earth, and serves to dispel the darkness of night. The diameter of the moon is 2,160 miles, its mean distance from the earth is 240,000 miles, and its mass is one eightieth that of the earth. See Lunar month, under Month..

Inequality :: Inequality (n.) An irregularity, or a deviation, in the motion of a planet or satellite from its uniform mean motion; the amount of such deviation..

Saturn :: Saturn (n.) One of the planets of the solar system, next in magnitude to Jupiter, but more remote from the sun. Its diameter is seventy thousand miles, its mean distance from the sun nearly eight hundred and eighty millions of miles, and its year, or periodical revolution round the sun, nearly twenty-nine years and a half. It is surrounded by a remarkable system of rings, and has eight satellites..

Umbra :: Umbra (n.) The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra..

Node :: Node (n.) One of the two points where the orbit of a planet, or comet, intersects the ecliptic, or the orbit of a satellite intersects the plane of the orbit of its primary..

Satellite :: Satellite (n.) An attendant attached to a prince or other powerful person; hence, an obsequious dependent..

Immersion :: Immersion (n.) The dissapearance of a celestail body, by passing either behind another, as in the occultation of a star, or into its shadow, as in the eclipse of a satellite; -- opposed to emersion..

Lunet :: Lunet (n.) A little moon or satellite.

Radius Vector :: Radius vector (n.) An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite..

Transit :: Transit (n.) The passage of a smaller body across the disk of a larger, as of Venus across the sun's disk, or of a satellite or its shadow across the disk of its primary..

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..

Eclipse :: Eclipse (n.) An interception or obscuration of the light of the sun, moon, or other luminous body, by the intervention of some other body, either between it and the eye, or between the luminous body and that illuminated by it. A lunar eclipse is caused by the moon passing through the earth's shadow; a solar eclipse, by the moon coming between the sun and the observer. A satellite is eclipsed by entering the shadow of its primary. The obscuration of a planet or star by the moon or a planet, thoug

Satellitious :: Satellitious (a.) Pertaining to, or consisting of, satellites..

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..

Moon :: Moon (n.) A secondary planet, or satellite, revolving about any member of the solar system; as, the moons of Jupiter or Saturn..

Satellite :: Satellite (a.) Situated near; accompanying; as, the satellite veins, those which accompany the arteries..

Secondary :: Secondary (n.) A satellite.

Opposition :: Opposition (n.) The situation of a heavenly body with respect to another when in the part of the heavens directly opposite to it; especially, the position of a planet or satellite when its longitude differs from that of the sun 180�; -- signified by the symbol /; as, / / /, opposition of Jupiter to the sun..

Dependency :: Dependency (n.) That which is attached to something else as its consequence, subordinate, satellite, and the like..

Undersphere :: Undersphere (n.) A sphere which is smaller than, and in its movements subject to, another; a satellite..

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