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What (who) is libration - definition

PERCEIVED OSCILLATING MOTION OF ORBITING BODIES RELATIVE TO EACH OTHER

Librations; Libration in latitude; Libration in longitude; Diurnal libration; Libration in Longitude; Libration in Latitude; Diurnal Libration; Lunar libration; Libration orbit; Libration of the moon; Moon wobble; Lunar wobble; Librartion; Optical libration; Geometrical libration

libration

[l??'bre??(?)n]

¦ noun Astronomy an apparent or real oscillation of the moon, by which parts near the edge of the disc that are often not visible from the earth sometimes come into view.

Derivatives

librate verb

Origin

C17: from L. libratio(n-), from librare 'weigh', from libra 'a balance'.

Libration

·noun The act or state of librating.

II. Libration ·noun A real or apparent libratory motion, like that of a balance before coming to rest.

Libration point

ONE OF FIVE POSITIONS IN AN ORBITAL CONFIGURATION OF TWO LARGE BODIES WHERE A SMALL OBJECT CAN MAINTAIN A STABLE RELATIVE POSITION

Lagrangian Point; Langrangian point; Lagrange points; Lagrange Points; LaGrange Point; Lagrange Point; Fifth Lagrange point; Fourth Lagrange Point; Third Lagrange Point; Second Lagrange Point; First Lagrange Point; Libration point; Lagrangian points; Lagrange orbit; LaGrange point; LaGrangian point; L1 Orbit; L2 point; L2 Earth-Sun Lagrange point; Lagrange 2; Inner lagrangian point; L5 point; Libration points; Lagrange 1 point; Lagrangian Points; Jacobi radius; Sun-Earth L1; Sun-Earth L2; Sun-Earth L3; L1 point; Earth–Moon L2; Earth–Moon L1; Earth-Moon L2; Earth-Moon L1; Earth L1; Lagrangian point; SE-L2; Lagrange point 2; L1 (Lagrange point)

·noun 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.

Wikipedia

Libration

In lunar astronomy, libration is the wagging or wavering of the Moon perceived by Earth-bound observers and caused by changes in their perspective. It permits an observer to see slightly different hemispheres of the surface at different times. It is similar in both cause and effect to the changes in the Moon's apparent size due to changes in distance. It is caused by three mechanisms detailed below, two of which cause a relatively tiny physical libration via tidal forces exerted by the Earth. Such true librations are known as well for other moons with locked rotation.

The quite different phenomenon of a trojan asteroid's movement has been called Trojan libration; and Trojan libration point means Lagrangian point.

https://en.wikipedia.org/wiki/Libration

Examples of use of libration

1. Agnes Poirier is the London correspondent of Libration.

2. For Libration it is his Waterloo, for France Soir, his Trafalgar.

3. The left–wing French newspaper Libration declared in its headline÷ Blairs new deal for Europe.

4. Libration, the left–of–centre newspaper, called on M Chirac to resign.

5. And we could suggest that Libration dispatch Mme Poirier to Vitrolles÷ shes obviously been away from home too long.