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libration - traduction vers français
![Simulated 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.](https://commons.wikimedia.org/wiki/Special:FilePath/LunarMonth.gif?width=200 "Simulated 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.")
![Winkel Tripel projection]]. [[Mare Orientale]], just outside the yellow region, is brought into visibility from Earth by libration.](https://commons.wikimedia.org/wiki/Special:FilePath/MoonVisibleLibration.jpg?width=200 "Winkel Tripel projection]]. [[Mare Orientale]], just outside the yellow region, is brought into visibility from Earth by libration.")
Définition
Wikipédia
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.
