noun Download 🔗Share The act of librating. Examples : "The child's librations of his arms and legs helped him to calm down. " astronomy physics Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The 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. Examples : "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. " astronomy space science phenomena Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share (by extension) A similar rotational or orbital characteristic of some other celestial body. Examples : "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. " astronomy physics space Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A vibrational degree of freedom whereby a group of atoms partly rotates back and forth, similar to the Moon's motion. Examples : "The scientist observed the librations of the small molecule, noting its slight back-and-forth rotational movement under the microscope. " physics astronomy technical chemistry Chat with AIVocabulary GamePractice Reading
