1 presentation(s) on '天球坐标系reference'
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spherical astronomy
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Tags:
Astronomy , Astronomy , Circle , Frame , Main , Measure , Point , Sphere , Spherical , 天球celestial , 天球坐标系reference , 时间计量time , 球面天文学Spherical
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By
Edolf
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Entertainment
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24 months ago|
 Download
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