The Day Master (日主, rì zhǔ) is the Heavenly Stem of your day pillar — the single character in a BaZi chart that represents you. Ten stems exist: the five elements Wood, Fire, Earth, Metal and Water, each in a yang and a yin form. Classical texts give each an image from nature — the tree, the sun, the mountain, the ocean — because the image teaches faster than the definition. Everything else in a reading — wealth, authority, output, support, competition — is calculated as a relationship to this one character.
Five elements, two polarities, ten archetypes
Questions, answered
The Day Master (日主) is the Heavenly Stem of your day pillar — the character that represents your core self in a BaZi chart. There are ten: each of the five elements (Wood, Fire, Earth, Metal, Water) in yang and yin form. Every other character in the chart is read by its relationship to the Day Master, through the Ten Gods system.
Calculate your Four Pillars from your birth year, month, day and hour — months follow the solar terms, and birth time should be timezone-corrected to Beijing time. The free calculator on this site shows your day pillar and Day Master instantly, no account needed.
No. Your zodiac animal is the Earthly Branch of your year pillar — one character of eight. Your Day Master is the Heavenly Stem of your day pillar, and it says far more about your core personality, work style and relationship patterns.
No. Yang and yin are modes, not ranks: Yang Wood is the tree, Yin Wood is the vine — differently strong, not stronger and weaker. Classical doctrine is explicit that each polarity wins in its own conditions.
No — it is fixed by your birth day. What changes are the 10-year luck cycles (Da Yun) and annual pillars around it, which is why the same Day Master experiences very different decades.
Which one are you?
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