2005/06/29 | 距角[Elongation]
类别(¤〖天文〗) | 评论(0) | 阅读(34) | 发表于 13:47
The elongation of a celestial body its the angular separation from the body about which it orbits (usually the Sun). Venus has a maximum elongation of 47°, and Mercury of 28°.
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