Noun
The act or state of librating.
A real or apparent libratory motion, like that of a balance before coming to rest.
Source: Webster's dictionarythe libration of the moon Source: Internet
Second, the longitudes of ascending nodes of the two bodies—the points where they cross the ecliptic—are in near-resonance with the above libration. Source: Internet
Jupiter trojans generally follow paths called tadpole orbits around the Lagrangian points; the average period of their libration is about 150 years. Source: Internet
Except for libration effects, this results in the Moon keeping the same face turned toward Earth, as seen in the figure on the left. Source: Internet
Not simplified, because the libration of the nodes must be taken into account. Source: Internet
The amplitude of the libration (along the Jovian orbit) varies from 0.6° to 88°, with the average being about 33°. Source: Internet