Toulouse AC Zone Data Reduced to ACRS

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）开展新版归算工作，该系统代表着……