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10:54 Jan 23, 2009
English to Chinese translations [PRO]
Science - Astronomy & Space
English term or phrase: libration
Definition from
The small oscillations in the moon’s motion that allow Earth-based observers to see slightly more than half the moon’s surface

Example sentence(s):
  • Libration is the apparent side to side rocking and up and down nodding of the Moon. There are two components: the more obvious "optical" and the very subtle "physical" libration.
  • Although the Moon always presents us with the same face towards the Earth, due to its rotation and revolution being tidally locked to the same period, the combined effect of all these different librations allows us over time to see some 59% of the Moon's surface. Wertern Washington University
  • Libration in longitude is a consequence of the Moon's orbit around Earth being somewhat eccentric, so that the Moon's rotation sometimes leads and sometimes lags its orbital position.
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Summary of translations provided
Gertrude Tsau
Angeline PhD


Translations offered

3 days 16 hrs   confidence: Answerer confidence 5/5

Definition from wiki:
月球光学天平动 optical libration of the Moon   即几何天平动,又称视天平动,月球天平动的一种。“月球常以同一面对着地球”的说法只是一种不严格的、近似的说法。

Example sentence(s):
  • 月球有三种光学天平动,纬天平动,经天平动和周日天平动。 - chinabaike  

Angeline PhD
Local time: 03:37
Native speaker of: Chinese
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4 days   confidence: Answerer confidence 5/5

Definition from Wiki 百科全書 :

Example sentence(s):
  • 為了取得在空天戰場的優勢,不少軍事理論家又對1764年法國數學家拉格朗日研究的“地—月係統”的五個天平動點(L1-L5)發生了濃厚的興趣。 - 新華網  
  • 科學家計算出水星的旋轉振動,即肇因於太陽引力的天平動,研究發現,水星的天平動比一個照理已徹底凝固的天體應有的天平動高出一倍,但卻符合一個擁有熔化外核以及不會和地殼一起旋轉的天體天平動。 - 大紀元  
  • 除了在月面邊沿附近的區域因天秤動而中間可見以外,月球的背面絕大部分不能從地球看見。在沒有探測器的年代,月球的背面一直是個未知的世界。 - 百度百科  
Gertrude Tsau
United States
Local time: 13:37
Native speaker of: Chinese
PRO pts in category: 4
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