2005/02/03 | 平均太阳时[Mean Solar Time]
类别(¤〖天文〗) | 评论(0) | 阅读(16) | 发表于 17:19
A time based on a hypothetical Sun moving uniformly along the celestial equator. The fluctuations have ranged between ± 30 seconds over the last 300 years.
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