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Qi Men Dun Jia is an ancient Chinese astrological system that dates back to the Han Dynasty (206 BCE - 220 CE). The name "Qi Men Dun Jia" roughly translates to "Seven Gates, Hidden Jia," referring to the seven celestial stems and the hidden Jia (a stem) within the system. QMDJ is used to analyze the dynamics of time and space, predicting auspicious and inauspicious periods for various activities. This method is based on the interaction between the five elements, the twelve branches, and the eight trigrams of the I Ching.