Uccle AC Zone Data Reduced to ACRS
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The U.S. Naval Observatory is in the process of making new reductions of the Astrographic Catalogue (AC) using a modern reference system, the ACRS, which represents the system...
美国海军天文台（U.S. Naval Observatory）目前正采用现代参考系统ACRS对天体照相星表（Astrographic Catalogue，AC）进行新版归算，该系统代表了……
