《晋书·志·第一章》
杓柄南面的三星及魁斗第一颗星西面的三颗星都叫三公，是主管宣扬道德教化、调和七政、均衡阴阳的官。
杓南三星及魁第一星西三星皆曰三公，主宜德化，调七政，和阴阳之官也。
The three stars to the south of the dipper and the three stars to the west of the first star of the Big Dipper are called the three dukes, who are officials in charge of promoting morality and education, harmonizing seven governments, and balancing yin and yang.