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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 . . .
    I am curious about the naming Why were the equilibrium solutions of the CR3BP called libration points? Who called them that and what is the history behind it?
  • Libration points - Science prospects - Space Exploration Stack Exchange
    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 (Both Earth-Moon and Sun-Earth L-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!
  • What does the term libration point gateway mean?
    These paths also supply transfers between whats-so-called "libration point gateways" However, I was wondering what is the difference between "transfers between libration point orbits" and "transfers libration point gateways" ?
  • What, if any, libration points exist in systems of multiple orbiting . . .
    8 Are there libration points in a restricted 4-body problem (system of three orbiting bodies of significant mass, plus the libration point orbiting body)? If so, how many of them exist and where are they located? Jovian system must have its periodic or quasi-periodic libration points
  • terminology - What is trade space in the context of libration orbit . . .
    Significant requirements affecting the JWST orbit design are the overall Libration Point Orbit (LPO) size, the avoidance of any Earth Moon eclipses, and propulsion other hardware restrictions This launch window trade analysis focuses on meeting these requirements and finds feasible epochs to launch the JWST observatory under these conditions
  • What sort of orbital elements are used to describe halo orbits?
    Caption for Figure 3: (the lower part with all the elbows): Fig 3 Bifurcation diagram for the Earth–Moon system (μ = 0 01215), showing families of periodic orbits that emanate from the libration points and from subsequent branch points The red cubes are the libration points Small white spheres denote branch points, and small dark-red spheres denote collision orbits The planar families
  • orbital mechanics - Are some Halo Orbits actually Stable? (stable . . .
    The pioneering paper on the analytical development of periodic halo orbits was published in 1973 by Farquhar and Kamel: "Quasi-Periodic Orbits about the Translunar Libration Point", Celestial Mech, Vol 7, pp 458-473
  • How can you construct the periodic orbits around libration points L1 . . .
    How can you construct the periodic orbits around libration points L1 and L2 in the circular restricted three-body problem and prove their existence? Ask Question Asked 5 years, 11 months ago Modified 1 month ago
  • What determines the orbital speed around a Lagrange point?
    This video shows a telescope in a Halo or Lissajous orbit near the Sun-Earth L2 point By moving slowly and tracing its path in both inertial and rotating (synodic) frames, you can see that the orbit is primarily around the sun, and the "orbit around" the libration point is a construct that comes from doing the math or thinking in a rotating frame: Turn your audio down or off first!





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