 |
| 我的日历 |
| |
|
| 分类日志 |
| |
|
| 友情链接 |
|
|
| 最新评论 |
|
|
| 搜索日志 |
|
|
| 访问计数 |
|
|
| 获取 RSS |
| |
 | |
| |
Saros循环[Saros Cycle] [2005-10-17]
iamet 发表在 ¤〖天文〗
| | 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. |
学好数理化，走遍天下都不怕！ | |
|
|
