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Si Fei Ri (四废日)​

Function​

Si Fei Ri (四废日) is one of the shensha (神煞) in Bazi (八字) astrology, referring to days in the four seasons—spring, summer, autumn, and winter—where the Heavenly Stems (天干) and Earthly Branches (地支) form an opposing structure to the seasonal dominant qi. People born on these days typically lack individuality and find it difficult to achieve significant success in their careers, often feeling like their talents are unrecognized or leading an ordinary life. Those born on Si Fei Ri may start things without finishing them, making it hard to succeed, and should pay special attention to health issues.

Method of Identification​

The method to identify Si Fei Ri is based on the opposing structure between the seasonal dominant qi and the Heavenly Stems and Earthly Branches. The specific days are as follows:

  • Spring: Geng Shen (庚申), Xin You (辛酉)
  • Summer: Ren Zi (壬子), Gui Hai (癸亥)
  • Autumn: Jia Yin (甲寅), Yi Mao (乙卯)
  • Winter: Bing Wu (丙午), Ding Si (丁巳)

These dates represent the conflict between metal, wood, water, and fire in the seasons, rendering the corresponding Heavenly Stems and Earthly Branches powerless, thereby affecting the personal fortune and career development of the individual.

The concept of Si Fei Ri originates from the changes in seasons and the mutual generation and overcoming of the Five Elements (五行). The dominant qi of the four seasons and the corresponding Heavenly Stems and Earthly Branches form a 180-degree opposing structure, making these days "waste days." People born on these days may have an ordinary personality and lack outstanding performance. The ancients believed that individuals born on Si Fei Ri often face suppression from external environments, lack opportunities, and find it difficult to achieve significant accomplishments in their lifetime.