《宋书·志·卷十二》
推算合朔、交会、月食的定大小余：将在迟疾历中的曰余乘以在迟疾历中相应日期的损益率，并以此减少或增加盈缩积分就得到定积分。
推合朔交会月蚀定大小余：以入历日余，乘所入历损益率，以损益盈缩积分为定积分。
Calculate the fixed size of the conjunction, conjunction and lunar eclipse: multiply the solar remainder in the slow and fast calendar by the profit and loss rate on the corresponding date in the slow and fast calendar, and reduce or increase the gain and loss integral to get the fixed integral.