Meaning & use
Libration
Last updated
A slow, slight oscillation of the Moon that allows observers on Earth to see slightly more than half of its surface over time.
See it in a sentence
Because of libration, astronomers can eventually map about 59 percent of the Moon's surface from Earth.
Lunar libration causes the Moon's visible disk to appear to wobble slightly from month to month.
A note on using this word
The term comes from the Latin 'libra,' meaning "balance" or "scale," describing the Moon's gentle back-and-forth tipping motion.
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