Six qi refers to the changes of six climatic factors, i.e., wind, heat, fire (summer- heat), dampness, dryness, and coldness. Among the six qi, summer-heat and heat pertain to fire, named ministerial fire and monarch fire respectively. When six qi is matched with three-yin and three-yang, they are called jueyin wind- wood, shaoyin monarch fire, taiyin dampness-earth, shaoyang ministerial fire, yangming dryness-metal, and taiyang coldness-water. The theory of six qi explains as well as predicts the general and specific climatic changes in a year based on the configuration of 12 earthly branches plus three-yin and three- yang. Specifically, six qi includes dominant qi, subordinate qi, and joining of subordinate qi to dominant qi.