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The Principal Qi (Zhu Qi) distributes in accordance with the solar terms and seasons, remaining constant throughout the year. The Guest Qi (Ke Qi) migrates sequentially according to the Si Tian (Heavenly Ruler) of the year, completing a cycle after six periods before restarting. When Principal Qi and Guest Qi overlap, there are differences between being "in harmony" (Xiang De) and "not in harmony" (Bu Xiang De). For instance, in the years of Zi and Wu, during the First Period, the Principal Qi is Jue Yin Wind Wood (Jueyin Fengmu), and the Guest Qi is Tai Yang Cold Water (Taiyang Han Shui). During the Second Period, the Principal Qi is Shao Yin Ministerial Fire (Shaoyin Junhuo), and the Guest Qi is Jue Yin Wind Wood: applying Water to Wood, and Wood to Fire, where the Mother generates the Son, constitutes being in harmony. During the Third Period, the Principal Qi is Shao Yang Ministerial Fire (Shaoyang Xianghuo), and the Guest Qi is Shao Yin Ministerial Fire; during the Fourth Period, the Principal Qi is Tai Yin Damp Earth (Taiyin Shitu), and the Guest Qi is Tai Yin Damp Earth: Fire meeting Fire, Earth meeting Earth, with identical Principal and Guest Qi, constitutes being in harmony. During the Fifth Period, the Principal Qi is Yang Ming Dry Metal (Yangming Zaojin), and the Guest Qi is Shao Yang Ministerial Fire: applying Fire to Metal, where Metal fears Fire's control, constitutes not being in harmony. During the Sixth Period, the Principal Qi is Tai Yang Cold Water, and the Guest Qi is Yang Ming Dry Metal: applying Metal to Water, where Metal can generate Water, also constitutes being in harmony. Being in harmony leads to health; not being in harmony leads to disease. However, cases exist where one is in harmony yet still falls ill, such as Water over Metal, Metal over Earth, or Earth over Fire. These represent the Child over the Mother, or the Lower over the Upper, which is termed "inappropriate position" (Bu Dang Wei), thus leading to disease. Nevertheless, this must be analyzed in conjunction with the strength or weakness of the Yearly Movement (Sui Yun). For example, in the Jia Zi year, the Earth element is excessive in the Yearly Movement. In the Third Period, with Shao Yin Ministerial Fire, applying Fire to Earth causes Earth to become even more prosperous without restraint; although this is technically in harmony, it is not truly harmonious. In the Geng Zi year, the Metal element is excessive in the Yearly Movement. In the Fifth Period, with Shao Yang Ministerial Fire, applying Fire to Metal controls the Metal, resulting in relative harmony; although this is technically not in harmony, it does not cause disease. Similarly, in cases like Water over Metal or Fire over Wood, if the Metal or Wood elements are deficient in the Yearly Movement, Metal becomes clear by receiving Water, and Wood becomes bright by receiving Fire; although these positions are inappropriate, they do not cause disease. Conversely, in cases like Water over Earth or Wood over Fire, if Wood or Fire are excessive in the Yearly Movement, Earth becomes hard by receiving Fire, and Fire burns fiercely by receiving Wood; although these positions are appropriate, they still cause disease. Furthermore, there is an advanced principle: when Earth is excessive and Wood cannot control it, Metal can instead drain Earth; when Wood is deficient and Water cannot nourish it, Fire can instead sustain Wood. This reflects the profound mystery of Heaven and Earth's generation. Those who wish to understand the principles of Five Movements and Six Qi (Yun Qi) should certainly not seek them superficially.