Heaven is divided into six sections, and the earth is divided into five sections. For weekly weather conditions, six periods are one backup; The age of five is equivalent to one week for those who have reached the end of their lives. Jun Huo uses light to illuminate, and Xiang Huo uses position. Five or six match, and seven hundred and twenty qi form one period. For those who are thirty years old, there are four hundred and forty qi, and for those who are sixty years old, they form one week. This is not too much, as we can see.
天以六为节，地以五为制。周天气者，六期为一备；终地纪者，五岁为一周。君火以明，相火以位。五六相合，而七百二十气为一纪，凡三十岁，千四百四十气，凡六十岁，而为一周，不及太过，斯皆见矣。