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File:Ancient Beijing observatory 14.jpg

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A large frame quadrant at the Beijing Ancient Observatory, constructed in 1673
Description Quadrant Altazimuth in Beijing Ancient Observatory 象限仪（地平纬仪）
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Author user:kallgan
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current11:19, 12 August 2013Thumbnail for version as of 11:19, 12 August 2013573 × 727 (85 KB)Soerfm (talk | contribs)Crop, contrast
12:11, 27 November 2006Thumbnail for version as of 12:11, 27 November 2006600 × 800 (61 KB)Kallgan (talk | contribs){{Information |Description=Quadrant Altazimuth in Beijing Ancient Observatory 象限仪（地平纬仪） |Source=self creation |Date=May 16 2006 |Author=user:kallgan |Permission={{PD-self}} |other_versions= }}

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