Moon Phase and Libration 2021 - Moon: NASA Science
https://moon.nasa.gov/resources/412/moon-phase-and-libration-2021/
WebNov 25, 2020 · When a month is compressed into 24 seconds, as it is in this animation, our changing view of the Moon makes it look like it's wobbling. This wobble is called libration, from libra, the scale. Supplemental graphics show the Moon's orbit, subsolar and sub-Earth points and the Moon's distance from Earth at true scale.
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