Bible Encyclopedias
Libration
1911 Encyclopedia Britannica
(Lat. libra, a balance), a slow oscillation, as of a balance; in astronomy especially the seeming oscillation of the moon around her axis, by which portions of her surface near the edge of the disk are alternately brought into sight and swung out of sight.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Libration'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/l/libration.html. 1910.