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libration    音标拼音: [lɑɪbr'eʃən]
n. 振动,天平动

振动,天平动

libration
n 1: (astronomy) a real or apparent slow oscillation of a moon
or satellite; "the libration of the moon"

Libration \Li*bra"tion\ (l[-i]*br[=a]"sh[u^]n), n. [L. libratio:
cf. F. libration.]
1. The act or state of librating. --Jer. Taylor.
[1913 Webster]

2. (Astron.) A real or apparent libratory motion, like that
of a balance before coming to rest.
[1913 Webster]

{Libration of the moon}, any one of those small periodical
changes in the position of the moon's surface relatively
to the earth, in consequence of which narrow portions at
opposite limbs become visible or invisible alternately. It
receives different names according to the manner in which
it takes place; as: {(a)} Libration in longitude, that
which, depending on the place of the moon in its elliptic
orbit, causes small portions near the eastern and western
borders alternately to appear and disappear each month.
({b}) Libration in latitude, that which depends on the
varying position of the moon's axis in respect to the
spectator, causing the alternate appearance and
disappearance of either pole. ({c}) Diurnal or parallactic
libration, that which brings into view on the upper limb,
at rising and setting, some parts not in the average
visible hemisphere.
[1913 Webster]


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  • Libration - Wikipedia
    Optical libration, observed from a point on Earth, it is the combination of longitudinal and latitudinal libration producing a movement of the sub-Earth point and a wobbling view between the temporarily visible parts of the Moon during a lunar orbit
  • LIBRATION Definition Meaning - Merriam-Webster
    The meaning of LIBRATION is an oscillation in the apparent aspect of a secondary body (such as a planet or a satellite) as seen from the primary object around which it revolves
  • Librations of the Moon - NASA
    Two-pan weighing scales can oscillate like a pendulum, back and forth across their equilibrium position, and supposedly the libration of the Moon resembles such motion In the equilibrium position, the long axis of the Moon points towards Earth, and libration temporarily shifts the earth-pointing tip of that axis to the north, south, east or west
  • Libration | Moon Phases, Tides Orbital Motion | Britannica
    The latitudinal libration of the Moon occurs because its axis is tilted slightly, relative to the plane of its orbit around the Earth; this makes the Moon’s north and south poles apparently alternate in tipping slightly toward the Earth as the Moon moves through its orbit The Moon’s longitudinal libration (a back and forth turning, a “headshaking” motion) results from its moving at
  • Libration (molecule) - Wikipedia
    Libration (molecule) A diatomic molecule experiencing libration Libration (from the Latin verb librare "to balance, to sway"; cf libra "scales") is a type of reciprocating motion in which an object with a nearly fixed orientation repeatedly rotates slightly back and forth
  • NASA SVS | Moon Phase and Libration, 2025
    The geocentric phase, libration, position angle of the axis, and apparent diameter of the Moon throughout the year 2025, at hourly intervals
  • LIBRATION | English meaning - Cambridge Dictionary
    LIBRATION definition: 1 a slight backwards and forwards movement of something, especially of planets etc in the sky… Learn more
  • libration - Wiktionary, the free dictionary
    libration (countable and uncountable, plural librations) The act of librating (astronomy) The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface (by extension) A similar rotational or orbital characteristic of some other celestial body (dynamics
  • Lunar Libration and its Relationship to Phases and Distance
    The primary cause of libration in longitude (E to W) is the Moon's eccentric orbit When the Moon is closer to the Earth it moves faster, and so the lunar rotation no longer keeps up with the orbital motion The Moon moves right to left from day to day as it revolves around the Earth (observer facing south), so during perigee when the Moon is closest we are seeing the greatest rate of increase
  • Lunar libration: what it is and how to photograph it
    Lunar libration is the apparent 'wobble' of the Moon from our perspective on Earth, caused by its orbit around our planet The Moon is gravitationally locked to Earth, rotating once on its axis in the same period of time that it takes to orbit our planet This means we see the same familiar face of the Moon all the time





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