《宋史·志·卷四》
南河三颗星，与北河夹着东井，一说是天的城关门户，主管关隘桥梁。
南河三星，与北河夹东井，一曰天之关门也，主关梁。
Three stars of the Southern River, with the Northern River flanking the eastern well; said to be the gates of heaven, overseeing the barriers and bridges.