2005/10/17 | Saros循环[Saros Cycle]
类别(¤〖天文〗) | 评论(0) | 阅读(19) | 发表于 20:58
Eclipses (either lunar or solar) occur when the line of nodes points towards Earth. This periodicity is called the Saros cycle, and has a period of 18 years and 11.3 days.
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