File:Ancient Beijing observatory 14.jpg

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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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A large frame quadrant at the Beijing Ancient Observatory, constructed in 1673

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16 May 2006

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current16:49, 12 August 2013Thumbnail for version as of 16:49, 12 August 2013573 × 727 (85 KB)wikimediacommons>SoerfmCrop, contrast

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