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简仪为元代天文学家郭守敬首创,原器于清代康燕晚年或乾隆初期熔毁。现存简仪是明代正统二至七年(公元1437～1442年)间按原器仿铸的,是简仪的唯一复制品。它曾经是北京古观象合上的主要观测设备;由于清初学习西欧制度另铸了一批天文仪器,明铸简仪随被移置台下,抗日战争前夕又迁往南京,现陈列在紫金山天文台(照片见封面)。
Jane was the first astronomer Guoshoujing Yuan Dynasty, the original device in the late Qing Dynasty Kangyan meltdown or Qianlong. The existing simple instrument is the Ming Dynasty orthodox two to seven years (AD 1437 ~ 1442) according to the original imitation cast, is the only copy of Jane instrument. It used to be the main observational equipment for the closure of the ancient images in Beijing. As a result of the study of a series of astronomical instruments in Western Europe during the early Qing Dynasty, Mingzhuanyi was relocated to Taiwan and moved to Nanjing on the eve of the Anti-Japanese War. Purple Mountain Observatory (photo see the cover).