Apparent oscillation of a minor body seen from the major body it orbits
This article is about astronomical observations. For molecular motion, see libration (molecule). For orbital mechanics, see libration point orbit.
Not to be confused with liberation, libation, or vibration.
This article focuses only on one specialized aspect of the subject. Please help improve this article by adding general information and discuss at the talk page.(July 2020)
The lunar phases and librations in 2019 in the Northern Hemisphere at hourly intervals, with music, titles, and supplemental graphicsSimulated views of the Moon over one month, demonstrating librations in latitude and longitude. Also visible are the different phases, and the variation in visual size caused by the variable distance from Earth.Theoretical extent of visible lunar surface (in green) due to libration, compared to the extent of the visible lunar surface without libration (in yellow). The projection is the Winkel Tripel projection. Mare Orientale, just outside the yellow region, is brought into visibility from Earth by libration.Diurnal libration of the moon as actually observed from beginning to end of a single night. The two angles are created by the different position of the observer with respect to the Moon due to the rotation of Earth over a few hours.
In lunar astronomy, libration is the cyclic variation in the apparent position of the Moon perceived by Earth-bound observers and caused by changes between the orbital and rotational planes of the moon. It causes 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.
In lunar astronomy, libration is the cyclic variation in the apparent position of the Moon perceived by Earth-bound observers and caused by changes between...
mechanics, the Lagrange points (/ləˈɡrɑːndʒ/; also Lagrangian points or libration points) are points of equilibrium for small-mass objects under the gravitational...
In orbital mechanics, a libration point orbit (LPO) is a quasiperiodic orbit around a Lagrange point. Libration is a form of orbital motion exhibited...
night to night, yet somewhat obvious in time-lapse photography. Lunar libration causes part of the back side of the Moon to be visible to a terrestrial...
7° north of the equator and the north pole is visible. This is called libration in latitude. The nodes are points at which the Moon's orbit crosses the...
The Derg (or Dergue; Amharic: ደርግ, lit. 'committee' or 'council'), officially the Provisional Military Administrative Council (PMAC), was the Marxist–Leninist...
lunar surface is visible over time due to cyclical shifts in perspective (libration), making parts of the far side of the Moon visible. The Moon has been...
Category:Spacecraft using halo orbits Libration point orbit Robert Farquhar (1966). "Station-Keeping in the Vicinity of Collinear Libration Points with an Application...
crater Herschel was considered to be a more likely explanation for the libration. In 2022, scientists at the Southwest Research Institute identified a...
repeated observations from Earth, due to the phenomena of libration and parallax. Librations are primarily caused by the Moon's varying orbital speed due...
well-ordering in term rewriting (computer science) Libertarian Party of Ohio Libration point orbit Licensed Post Office Limited principle of omniscience London...
perturbing body—in this case, Neptune. Relative to Neptune, the amplitude of libration is 38°, and so the angular separation of Pluto's perihelion to the orbit...
orbit is both somewhat elliptical and inclined to its equatorial plane, libration allows up to 59% of the Moon's surface to be viewed from Earth (though...
far side is occasionally visible from Earth due to oscillation and to libration. The remaining 82 percent remained unobserved until 1959, when it was...
Dante. Galileo is sometimes credited with the discovery of the lunar libration in latitude in 1632, although Thomas Harriot or William Gilbert might...
frequency" concept in SETI radio beacon theory, the Earth-Moon or Sun-Earth libration orbits might therefore constitute the most universally convenient parking...
Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere. The apparent wobbling of the Moon is known as libration....
Earthshine Orbit Lunar distance Orbital elements Distance Perigee and apogee Libration Nodes Nodal period Precession Syzygy New moon Full moon Eclipses Lunar...
Earthshine Orbit Lunar distance Orbital elements Distance Perigee and apogee Libration Nodes Nodal period Precession Syzygy New moon Full moon Eclipses Lunar...
looking for a photometrically confirmable concentration of dust at the libration (Lagrangian) points in 1951. After a change in method suggested by Josef...
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