《宋书·志·卷十二》
该年十一月甲寅曰发布的诏书说： 漏壶就是用来计测时刻、确定昏明的。
其年十一月甲寅，诏曰： 漏所以节时分，定昏明。
The edict issued on Jiayin Day in November of that year said: The water clock is used to measure the moment and determine the twilight.