《宋书·志·卷十二》
推算合朔、交会、月食的方法说：取所求朔在相应纪中的朔积分，加上相应纪的交会差率，所得满会通则减去会通，其差就是所求年与周正相应的十一月合朔时、月距黄白交点的度分数。
推合朔交会月蚀术曰：置所入纪朔积分，以所入纪交会差率之数加之，以会通去之，余则所求年天正十一月合朔去交度分也。
The method for calculating the conjunction, the meeting, and the lunar eclipse: take the corresponding epoch's conjunction integral in the requested new moon, add the corresponding epoch's meeting difference, and subtract the meeting when it is full; the remainder is the number of degrees between the sun and the ecliptic conjunction at the time of the conjunction in November corresponding to the requested year and the week.