2005/07/16 | 天球[Celestial Sphere]
类别(¤〖天文〗) | 评论(0) | 阅读(33) | 发表于 20:32
The projection of objects in space into their apparent positions in the sky as viewed from the Earth. Although the stars, planets, constellations, etc., all lie at different distances from the Earth, they all can be depicted as lying on this single sphere.
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