ASTROMETRIC OBSERVATIONS AFTER 1988.0  

作　　者：Li Zhengxin(Shanghai Observatory, Chinese Academy of Sciences ) 

出　　处：《中国科学院上海天文台年刊》1994年第15期45-48,共4页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

摘　　要：After the closing of the BIH at 1988. 0, 64-42 optical astrometric instrumcnts over the world were still operated in the past four years. A brief presentation of its situation since 1988. O is described, including the number of instruments operated, the numbor of mcasurements made,avorage precision of a group measurement and BRP obtained. A short discussion is also given.After the closing of the BIH at 1988. 0, 64-42 optical astrometric instrumcnts over the world were still operated in the past four years. A brief presentation of its situation since 1988. O is described, including the number of instruments operated, the numbor of mcasurements made,avorage precision of a group measurement and BRP obtained. A short discussion is also given.

关 键 词：地球自转参数 纬度测量 天文学 ERP 时间测量 

分 类 号：P183.31[天文地球—天文学] P127