Thank you for that question. I would like first to summarise the relationship between 5 phases and 6 divisions.
5 phases work with 6 qi to find expression as 6 divisions. When we look at the divisions from this point of view we have:
• Jue Yin, Wood, growing Qi, wind
• Shao Yin, Fire Prince, expanding Qi, summer heat,
• Shao Yang, Ministerial Fire, full grown Qi, fire,
• Tai Yin, Earth, changing qi, dampness,
• Yang Ming, Metal, gathering Qi, dryness,
• Tai Yang, Water, hidden qi, cold,
In 5 phases picture of the divisions Jué Yin, Wood, Shao Yang, Fire Minister – are in Sheng cycle relationship, which is a nourishing cycle. The Sheng cycle is about unfolding, growing, declining and supporting of form, and is related more with the day time, and with manifested, tangible world. It describes the unfolding of form.
In contrast, the Ke cycle, is often described as a controlling cycle. However, this “controlling” cycle is not merely restrictive; on a physiological level it represents the emerging and life-enriching aspects of regulation and transformation. Ke cycle is related more with the night time, and in physiology expresses the unfolding of principles of life.
Coming back to Shao Yang and Jue Yin being in Sheng cycle relationship, we can say that they are Yang in nature (wood, fire phase) and they support, the quality and quantity of Qi and Blood which are manifested in form (Yin) needed for unfolding of life of the human being.
Those qualities are needed for the branches Si (Sp), Hai (Th), Yin (Lu) and Shen (Bl). Because, the vertical axis (Si-Hai) brings inspiration and inner orientation from the subtle realm into movement, while the horizontal axis (Yin-Shen) manifests this guidance as lived direction, shaping perception and meaning in tangible experience.
Regards!
Pawel