thumb|The lunar phases and librations in 2019 in the Northern Hemisphere at hourly intervals, with music, titles, and supplemental graphics alt=Over one lunar month more than half of the Moon's surface can be seen from the surface of the Earth.|thumbtime=0:02|thumb|Simulated views of the Moon over one month, demonstrating librations in latitude and [[longitude. Also visible are the different phases, and the variation in visual size caused by the variable distance from the Earth.]] thumb|Theoretical extent of visible lunar surface (in green) due to libration, compared to the extent of the visib
Libration is a slight rocking or wobbling motion that allows us to see slightly more than half of the Moon's surface over time, even though the same side always faces Earth. This matters because it means that from Earth, we can eventually observe about 59% of the Moon's surface rather than just 50%, giving us a more complete view of our nearest celestial neighbor.
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在天文學中,天平動(英語:Libration)是從衛星環繞的天體上觀察所見到的,真實或視覺上非常緩慢的振盪。儘管這些振盪亦適用於其他行星,甚至太陽,但天文學家們長久以來都只用在月球相對於地球的視運動,並且選擇一個點來平衡與對比晃動的尺度。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).