《宋书·志·卷十二》
推算在相应月中的日期：将月余乘以通数，将朔小余乘以合月法，将两者合并后再除以通法，所得之商再除以曰度法就得到五星发生合在相应月中的日期，其余数是余。
推入月日：以通数乘月余，合月法乘朔小余，并之，通法约之，所得满日度法得一，则星合入月日也，不满为日余。
Calculate the date in the corresponding month: Multiply the remaining days of the month by the common method, multiply the small remainder of the new moon by the synodic month method, combine the two and then divide by the common method, and then divide the quotient by the daily method to obtain the date of the conjunction of the five stars in the corresponding month, The remainder is the remainder.