2005/11/06 | 民用晨昏蒙影[Civil Twilight]
类别(¤〖天文〗) | 评论(0) | 阅读(24) | 发表于 14:07
The period of twilight beginning (or ending) when the center of the (refracted) Sun is more than 6° below the horizon.
0

评论Comments

日志分类
首页[1408]
∑〖数学〗[349]
Ω〖物理〗[357]
¤〖天文〗[343]
℃〖化学〗[359]