Ancient Beijing observatory 14.jpg
[[user:kallgan
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Ancient Beijing observatory 14, Quadrants (instrument)
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Ancient Beijing observatory 14, A large frame quadrant at the Beijing Ancient Observatory, constructed in 1673, Quadrant Altazimuth in Beijing Ancient Observatory 象限仪（地平纬仪）, A large frame quadrant at the Beijing Ancient Observatory.  It was constructed in 1673.
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北京天文台14番館
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北京天文台の巨大フレーム象限(地平)。北京天文台の巨大フレーム象限象限。延宝元年の建立。
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quadrant altazimuth