2005/01/30 | 国际原子时间[International Atomic Time]
类别(¤〖天文〗) | 评论(0) | 阅读(61) | 发表于 19:54
International Atomic Time (TAI) is measured in the SI second, defined in terms of vibrations of a cesium atom. It is therefore not explicitly tied to the Earth's rotation, although that was of course the motivation for the original definition of the second.
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