Beijing Ancient Observatory

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中文: 北京古观象台是明清两代和北洋政府时期的国家天文台。建于1442年，是世界上最古老的天文台之一。

English: The Beijing Ancient Observatory was the national Chinese planetarium at the time of the Ming and Qing dynasties. Built in 1442, it is one of the world's oldest of its kind.

[edit] Instruments

赤道经纬仪 Equatorial Armilla	纪限仪 Sextant	地平经纬仪 Azimuth Theodolite	地平经仪 Altazimuth
清代浑仪（玑衡抚辰仪） Qing Dynasty's Armillary Sphere	象限仪(地平纬仪) Quadrant Altazimuth	赤道经纬仪（远处）及纪限仪（近处） Equatorial Armilla and Sextant	黄道经纬仪 Ecliptic Armilla
天体仪 Celestial Globe	地平经仪 Altazimuth	地平经纬仪 Azimuth Theodolite	明代浑仪复制品 a replica of Ming Dynasty's Armillary Sphere in the garden
an instrument to caculate midwinter date		日晷 a solarium made in 1790	a marble instrument to caculate equinox date
明代浑仪复制品 another replica of Ming Dynasty's Armillary Sphere in the courtyard	简仪 simplified armilla	简仪 simplified armilla	正方案 The Square Table