Definition of moon

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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..

Lern More About Moon

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..
Perigeum :: Perigeum (n.) That point in the orbit of the moon which is nearest to the earth; -- opposed to apogee. It is sometimes, but rarely, used of the nearest points of other orbits, as of a comet, a planet, etc. Called also epigee, epigeum..
Pale :: Pale (v. i.) Not bright or brilliant; of a faint luster or hue; dim; as, the pale light of the moon..
Revolution :: Revolution (n.) The motion of any body, as a planet or satellite, in a curved line or orbit, until it returns to the same point again, or to a point relatively the same; -- designated as the annual, anomalistic, nodical, sidereal, or tropical revolution, according as the point of return or completion has a fixed relation to the year, the anomaly, the nodes, the stars, or the tropics; as, the revolution of the earth about the sun; the revolution of the moon about the earth..
Moon-eyed :: Moon-eyed (a.) Having eyes affected by the moon; moonblind; dim-eyed; purblind.
Waniand :: Waniand (n.) The wane of the moon.
Semilunar :: Semilunar (a.) Shaped like a half moon.
Mooned :: Mooned (imp. & p. p.) of Moo.
Astrometeorology :: Astrometeorology (n.) The investigation of the relation between the sun, moon, and stars, and the weather..
Neomenia :: Neomenia (n.) The time of the new moon; the beginning of the month in the lunar calendar.
Epact :: Epact (n.) The moon's age at the beginning of the calendar year, or the number of days by which the last new moon has preceded the beginning of the year..
Moonrise :: Moonrise (n.) The rising of the moon above the horizon; also, the time of its rising..
Rising :: Rising (a.) Attaining a higher place; taking, or moving in, an upward direction; appearing above the horizon; ascending; as, the rising moon..
Moonseed :: Moonseed (n.) A climbing plant of the genus Menispermum; -- so called from the crescentlike form of the seeds.
Decrescent :: Decrescent (a.) Becoming less by gradual diminution; decreasing; as, a decrescent moon..
Emersion :: Emersion (n.) The reappearance of a heavenly body after an eclipse or occultation; as, the emersion of the moon from the shadow of the earth; the emersion of a star from behind the moon..
Evection :: Evection () An inequality of the moon's motion is its orbit to the attraction of the sun, by which the equation of the center is diminished at the syzygies, and increased at the quadratures by about 1¡ 20'..
Luniform :: Luniform (a.) Resembling the moon in shape.
Moonshiner :: Moonshiner (n.) A person engaged in illicit distilling; -- so called because the work is largely done at night.
Cusp :: Cusp (n.) The point or horn of the crescent moon or other crescent-shaped luminary.
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