《宋书·志·卷十二》
将其乘以章闰，所得每满章月一次就有一个闰月，在入纪月中减去闰月数，其差每满岁中则减去岁中，最后所得余数就是入岁月，从周正起算并向外推后一月就是五星发生合的月份。
副以章闰乘之，满章月得一为闰，以减入纪月，余以岁中去之，余为入岁月，命以天正起，算外，星合月也。
Multiply it by the intercalary regulation, for every full intercalary month, there is an intercalary month, deduct the number of intercalary months from the chronological month, for every full year, deduct the year, the final remainder is the chronological year, from the beginning of the Zhou calendar, pushing back one month is the month when the five stars have a conjunction.