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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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  • Who named the Lagrangian points libration points and why was the . . .
    "Libration" comes from latin "librare" and means "to keep balance" And this is because in a three-body problem objects keep balance in this points I do not know who named it "Libration Points" first, I would assume LaGrange or Euler I would even assume: they have been first called "libration points" and later "LaGrange Points"
  • Does it even make sense to talk about Mercurys triangular libration . . .
    At Mercury's triangular libration points, it is the gravitational effect of Mercury that would keep objects there So you need to compare the gravitational effects of Venus vs Mercury Since Venus is more massive and actually comes closer to Mercury's L4 L5 than Mercury does from time to time, the effect is huge!
  • orbit - Libration points - Space Exploration Stack Exchange
    There have been quite a few missions to libration points As far as the dynamical possibilities are concerned, libration point vicinity offers a spectrum of orbit profiles What science data is not available and is relevantly needed by the space science community, that can be fulfilled by a spacecraft placed in an orbit around libration points
  • What does the term libration point gateway mean?
    The term "libration point gateways" is rare enough that you would have to presisely define it if you want to use it Without context, like this, it's ambiguous A plausible interpretation is that it refers to the parts of the connected system of libration point orbits where one can conveniently enter from or leave to the outside
  • space telescope - Why has the Earth-Sun libration point L1 been chosen . . .
    above: Profoundly not-to-scale illustration of NEOCam in an orbit around the Sun-Earth libration point L1, about 1 5 million kilometers from Earth Presumably Sun-shield and Earth-shield block light (both infrared and visible) from the Sun and the Earth in order for the instrument to work at cold temperature necessary to detect the faint
  • orbital mechanics - Cis-L2 Libration Point Halo Orbit - Space . . .
    $\begingroup$ Cool question! As I mention in this long-winded answer a halo orbit around an Earth-Moon Lagrange point is really a Earth orbit that happens to be in a 1:1: resonance with the Moon
  • How to calculate libration amplitude of objects orbiting the
    By amplitude I mean the distance along the orbit between the two extremes of libration I e the point in the tadpole orbit (as examined in a co-rotating frame) where the orbiting test object is farthest from the planet, and then the point at the other extreme where the test object most closely approaches the planet before turning back toward
  • gravity - Why are the Trojan libration points equidistant and not mass . . .
    The locations of the collinear Lagrange points L1, L2, L3 are mass weighted, so for example Sun-Earth-L1 is only 1% of the distance to the Sun from Earth But L4 and L5 are one AU from both the Sun
  • orbital mechanics - Space Exploration Stack Exchange
    $\begingroup$ The GIF of our Moon's libration removes the movement in the sky leaving only the libration (apparent tilting and rolling of the surface due to constant rotation but variable orbital velocity, and inclination) and variation in size due to variation in distance
  • How can you construct the periodic orbits around libration points L1 . . .
    Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers





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