"Librating" is a word in ENGLISH

The libration of the moon.

To vibrate as a balance does before resting in equilibrium; hence, to be poised.

To poise; to balance.

of Librate

The act or state of librating.

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

any one of five points in the plane of a system of two large astronomical bodies orbiting each other, as …

To find by logical processes; to explain or justify by reason or argument; -- usually with out; as, to reason …

A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain …