noun🔗ShareThe act of librating."The child's librations of his arms and legs helped him to calm down. "astronomyphysicsChat with AIVocabulary GamePractice Reading
noun🔗ShareThe apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface."The moon's librations allow us to see a little bit more of its surface over time, as it appears to wobble slightly in the sky. "astronomyspacesciencephenomenaChat with AIVocabulary GamePractice Reading
noun🔗Share(by extension) A similar rotational or orbital characteristic of some other celestial body."The Earth's librations affect the timing of our sunrise, and similarly, the moon's librations cause us to see slightly different portions of its surface from Earth. "astronomyphysicsspaceChat with AIVocabulary GamePractice Reading
noun🔗ShareA vibrational degree of freedom whereby a group of atoms partly rotates back and forth, similar to the Moon's motion."The scientist observed the librations of the small molecule, noting its slight back-and-forth rotational movement under the microscope. "physicsastronomytechnicalchemistryChat with AIVocabulary GamePractice Reading
