The ACT Reference Catalog
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The U.S. Naval Observatory has completed the compilation of the ACT Reference Catalog, containing 988,758 stars covering the entire sky. The motivation behind the ACT was to...
美国海军天文台（U.S. Naval Observatory）已完成ACT参考星表（ACT Reference Catalog）的编制工作，该星表共收录988,758颗覆盖全天空的恒星。编制该星表的初衷是为了……
