survey of the changing periods and qi in a cycle of sixty years. All a reader has to know is a given year's stem and branches. He or she may then check these tables for this year's period and qi, for its climatic condition and illnesses.
THEORETICAL ISSUES FROM THE SU WEN DOCTRINE
OF THE FIVE PERIODS AND SIX QI
the Qi at the Fountain “Joins” from Below
The doctrine of the five periods and six qi employs a visual model of three levels. “Above” is the qi controlling heaven; “below” is the qi at the fountain.