《宋书·志·卷十三》
我认为，太阳运勇一固有快慢，所以才有斗宿范围的变化，之代人规定章的大小时取的是中间值，十九匀中安排七个闰月，圭表影长或许有变化，杜这原则是不可改变的。
臣法兴议：夫日有缓急，故斗有阔狭，古人制章，立为中格，年积十九，常有七闰，晷或虚盈，此不可革。
I believe that the sun's running speed has its own fast and slow, so there is a change in the range of the bucket's house. The size of the chapter is the middle value, and seven leap months are arranged in 19 jun. The shadow of the sundial may change. This principle cannot be changed.