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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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