《明史·志·卷三十七》
黄钟，产生于虚危二宿之气，是宗庙，祭祀人鬼从这里起宫，在琴中宫弦第三徽，就是子位。
黄钟，生于虚危之气，为宗庙，祭人鬼从此起宫，在琴中宫弦第三徽，子位也。
The G pitch originates in the air of the Xuwei and Er mansions. It is the ancestral temple, and the palace where sacrifices to humans and ghosts begin. This is the子position, the third pitch on the gong string of the zither.