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Research on multi-star observation and astronomical longitude and latitude calculation based on optical wide field measurement equipment

WANG Kang-xiang①②③,HE Xin①,WEI Zhong-hui①,YU Hui-long①②,WANG Dong-he①②,WEN Ying-hui①②③(①Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;②Graduate School of Chinese Academy of Sciences,Beijing 100039,China;③ Huayin Ordnance Test Center of China,Huayin 714200,China)  
A new method for measuring the astronomical coordinate of a location based on optical wide field measurement equipment is discussed in this paper.Firstly we measure the increment of multi-star's azimuth angle from mean optical axis's azimuth angle.Then we can calculate the astronomical coordinate of a location by the method of nonlinear least square.Using this method we can avoid the discussion of the atmospheric refraction,and achieve a higher measuring precision.
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