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librations
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天平动
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详细解释：
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以下为句子列表：
英文: Despite the Moon's rotational and orbital periods being exactly locked, we may actually observe about 59% of the moon's total surface with repeated observations from earth due to the phenomena of librations and parallax.
中文: 尽管完全地被锁的月亮的回转而轨道的期数，我们由于振动和视差的现象可能实际上用来自地球的重复的观察观察大约59%月亮的完全表面。
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英文: Librations are primarily caused by the Moon's varying orbital speed due to the eccentricity of its orbit: this allows us to see up to about 6° more along its perimeter.
中文: 振动主要地由月亮所引起正在由于它的轨道的古怪改变轨道的速度:这让我们沿着它的周长见到达大约6°更多。
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英文: NOTE 8 The unbroken chain of calibrations or comparisons may be achieved in several steps carried out by different laboratories that can demonstrate traceability.
中文: 注8:不间断的校准或比较链,可以通过不同的、能证明溯源性的实验室以过若干步骤来实现.
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英文: Such fine calibrations may date back to the use of the abacus, and to an old Chinese convention that assumes a 360-day year for the purpose of reckoning interest payments.
中文: 如此精细的调整可追溯到算盘的使用，追溯到中国的一个古老传统，即假设一年为360天，以达到简化利息支付的目的。
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英文: The DMA 4100 can be set to give periodical calibration requests and the results of the calibrations are stored in the instrument (ISO requirement).
中文: DMA 4100可设置为周期性校准要求，且仪器自动保存校准结果（ISO要求）。
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