📌 Key Takeaways
The Day Pillar (日柱) is the most important column in your Four Pillars chart — it reveals your true self, inner character, and the nature of your closest relationships. Understanding your Day Master (日干) is the foundation of all Saju analysis.
📋 Contents
- ▶The Four Pillars Structure
- ▶Why the Day Pillar Matters Most
- ▶The 10 Day Masters (十干) Explained
- ▶Day Branch: Root Energy & Spouse Palace
- ▶Strong vs. Weak Day Master
The Four Pillars Structure
Your Saju chart consists of four pillars (四柱), each representing a different time unit of your birth — Year, Month, Day, and Hour. Each pillar has two characters: a Heavenly Stem (天干) on top and an Earthly Branch (地支) below, totaling eight characters (八字).
| Pillar | Year (年) | Month (月) | Day (日) | Hour (時) |
|---|---|---|---|---|
| Represents | Ancestors, Social Era | Parents, Youth | Self, Spouse | Children, Later Life |
Why the Day Pillar Matters Most
The Day Pillar is uniquely important because the Day Stem (日干) is "you" — the central reference point from which all relationships in the chart are defined. Every other character in your chart is analyzed in relation to the Day Stem, determining its role (the Ten Gods / 十星) and influence on your life.
💡 Day Stem = Your True Self
While your Year Pillar reflects your social background and your Month Pillar shows your public persona, the Day Stem reveals who you truly are at your core — your deepest values, natural tendencies, and authentic self.
The 10 Day Masters (十干) Explained
The 10 Heavenly Stems (天干) each carry distinct qualities, alternating between Yang (陽) and Yin (陰):
| Stem | Element | Polarity | Core Nature |
|---|---|---|---|
| 甲 (Jiǎ) | Wood | Yang | Leadership, moral integrity, directness |
| 乙 (Yǐ) | Wood | Yin | Adaptability, social intelligence, persistence |
| 丙 (Bǐng) | Fire | Yang | Radiance, generosity, charisma |
| 丁 (Dīng) | Fire | Yin | Depth, warmth, focused illumination |
| 戊 (Wù) | Earth | Yang | Reliability, protection, stability |
| 己 (Jǐ) | Earth | Yin | Nurturing, carefulness, precision |
| 庚 (Gēng) | Metal | Yang | Authority, decisiveness, directness |
| 辛 (Xīn) | Metal | Yin | Refinement, sensitivity, aesthetic sense |
| 壬 (Rén) | Water | Yang | Resourcefulness, ambition, vast potential |
| 癸 (Guǐ) | Water | Yin | Intuition, depth, emotional wisdom |
Day Branch: Root Energy & Spouse Palace
The Earthly Branch of the Day Pillar (日支) serves two critical functions:
- Root (根) for the Day Master: If the Day Branch shares the same element as the Day Master, it "roots" or empowers the Day Master. For example, a Wood Day Master with a Wood or Water Branch receives strong support.
- Spouse Palace (配偶者宮): The Day Branch reveals the nature of your closest partnerships and romantic relationships. Its element and any Ten Gods residing within it describe the qualities of your ideal partner.
Strong vs. Weak Day Master
One of the most fundamental assessments in Saju is whether your Day Master is strong (身強) or weak (身弱). This determines your Favorable Element (用神), which is the key to understanding what supports your growth and happiness in life.
AI-powered Saju analysis automatically calculates your Day Master strength and identifies your Favorable Element, giving you a personalized roadmap based on your unique chart.