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Ignoring the likely functionally uninteresting bond vibrations, the very shortest times are the fundamental group librations and rotations of methyl groups, which typically occur in the picosecond range.
This can be simplified further by recognizing that local bond librations and other motions are likely to occur on very different timescales, and thus their averages can be computed independently.
The visibility of this formation is affected by libration, and even under favorable conditions it is highly foreshortened.
At this location the crater appears much foreshortened and can only be observed during favorable librations.
As a result, spacecraft in libration point orbits must use their propulsion systems to perform orbital station-keeping.
That is, the features that would produce a contour effect along the limb due to libration.
It was the first artificial object placed at a so-called libration point, proving that such a suspension between gravitational fields was possible.
It can also become hidden from sight due to libration, or brought into a more favorably viewing position.
In this location the vicinity of the crater can be viewed during favorable librations, although it is viewed from on edge.
Due to its proximity to the western lunar limb, this area of the surface is occasionally visible during favorable librations.
It lies just beyond the western limb, at the far edge of the region that is brought into view during favorable librations.
The study was conducted inside the interval where libration happens.
In addition, to the extent that tides produce heat along fractures libration may affect the magnitude and distribution of such tidal shear heating.
Other observations suggest they move around the libration points in ellipses of about 6 by 2 degrees.
It can also become hidden from sight due to the effects of libration.
