Last updated: March 2026 · 12 min read
SajuFour PillarsKorean Astrology五行사주팔자Saju (사주, literally "four pillars") is a form of East Asian astrology that has been practiced in Korea for over a thousand years. Known formally as 사주팔자 (sa-ju-pal-ja), meaning "four pillars, eight characters," this system analyzes the cosmic energy present at the exact moment of your birth to reveal insights about personality, destiny, relationships, career, and health.
Unlike Western astrology which focuses primarily on the position of planets and stars, Saju is rooted in the interaction of the Five Elements (오행/五行) — Wood, Fire, Earth, Metal, and Water — as expressed through the Chinese sexagenary cycle of Heavenly Stems (천간/天干) and Earthly Branches (지지/地支).
Your Saju chart consists of four pillars, each derived from a specific aspect of your birth time:
| Pillar | Korean | Represents | Influence |
|---|---|---|---|
| Year Pillar | 년주 (年柱) | Year of birth | Ancestry, social persona, early childhood |
| Month Pillar | 월주 (月柱) | Month of birth | Parents, career, young adulthood |
| Day Pillar | 일주 (日柱) | Day of birth | Self, spouse, core identity |
| Hour Pillar | 시주 (時柱) | Hour of birth | Children, later life, inner desires |
Each pillar contains two characters: a Heavenly Stem (천간) on top and an Earthly Branch (지지) on the bottom. Together, these eight characters form your complete birth chart — your 팔자 (eight characters of destiny).
The single most important element in your Saju chart is the Heavenly Stem of your Day Pillar, known as the Day Master (일간). This character represents your core self — your fundamental nature, personality, and how you interact with the world. All other elements in the chart are interpreted in relation to the Day Master.
| Stem | Element | Yin/Yang | Character Traits |
|---|---|---|---|
| 甲 (갑) | Wood | Yang | Leadership, ambition, pioneer spirit |
| 乙 (을) | Wood | Yin | Flexibility, creativity, diplomacy |
| 丙 (병) | Fire | Yang | Charisma, passion, optimism |
| 丁 (정) | Fire | Yin | Warmth, insight, quiet intensity |
| 戊 (무) | Earth | Yang | Stability, reliability, generosity |
| 己 (기) | Earth | Yin | Nurturing, detail-oriented, practical |
| 庚 (경) | Metal | Yang | Determination, justice, resilience |
| 辛 (신) | Metal | Yin | Precision, beauty, sensitivity |
| 壬 (임) | Water | Yang | Wisdom, adaptability, resourcefulness |
| 癸 (계) | Water | Yin | Intuition, mystery, depth |
The Five Elements form the foundation of Saju interpretation. Each element has a productive and destructive relationship with the others, creating a dynamic interplay that shapes your destiny:
Wood feeds Fire → Fire creates Earth (ash) → Earth bears Metal (ore) → Metal collects Water (condensation) → Water nourishes Wood
Wood breaks Earth → Earth absorbs Water → Water extinguishes Fire → Fire melts Metal → Metal cuts Wood
A balanced chart with harmonious elemental interactions typically indicates a smoother life path, while imbalances point to specific challenges and growth opportunities.
| Branch | Animal | Element | Hours |
|---|---|---|---|
| 子 (자) | Rat (쥐) | Water | 23:00–01:00 |
| 丑 (축) | Ox (소) | Earth | 01:00–03:00 |
| 寅 (인) | Tiger (호랑이) | Wood | 03:00–05:00 |
| 卯 (묘) | Rabbit (토끼) | Wood | 05:00–07:00 |
| 辰 (진) | Dragon (용) | Earth | 07:00–09:00 |
| 巳 (사) | Snake (뱀) | Fire | 09:00–11:00 |
| 午 (오) | Horse (말) | Fire | 11:00–13:00 |
| 未 (미) | Goat (양) | Earth | 13:00–15:00 |
| 申 (신) | Monkey (원숭이) | Metal | 15:00–17:00 |
| 酉 (유) | Rooster (닭) | Metal | 17:00–19:00 |
| 戌 (술) | Dog (개) | Earth | 19:00–21:00 |
| 亥 (해) | Pig (돼지) | Water | 21:00–23:00 |
One of the most powerful aspects of Saju is the calculation of Major Luck Cycles (대운). These are 10-year periods that overlay your birth chart, each bringing different elemental energies that interact with your natal pillars.
Most people experience 7-8 major luck cycles in their lifetime, starting between ages 1-9 depending on the chart. Understanding these cycles helps you know when to push forward aggressively and when to consolidate and prepare.
The direction of your luck cycles — forward (순행) or backward (역행) — is determined by your gender and the Yin/Yang nature of your birth year stem.
The Ten Gods system describes the relationship between your Day Master and every other element in your chart. These relationships reveal dynamics in career, wealth, relationships, authority, and creativity:
| God | Korean | Meaning |
|---|---|---|
| Companion (비견) | 比肩 | Friends, siblings, competition |
| Rob Wealth (겁재) | 劫財 | Bold action, risk, loss of wealth |
| Eating God (식신) | 食神 | Creativity, food, enjoyment of life |
| Hurting Officer (상관) | 傷官 | Rebellion, talent, speaking out |
| Direct Wealth (정재) | 正財 | Salary, steady income, spouse (for men) |
| Indirect Wealth (편재) | 偏財 | Windfall, investment, speculative gains |
| Direct Officer (정관) | 正官 | Authority, career, discipline, husband (for women) |
| Seven Killings (편관) | 偏官 | Power, pressure, transformation |
| Direct Resource (정인) | 正印 | Mother, education, support, kindness |
| Indirect Resource (편인) | 偏印 | Unconventional wisdom, loneliness, special skills |
While both systems seek to understand personality and predict life patterns from birth data, they differ fundamentally in approach:
| Aspect | Saju (Korean) | Western Astrology |
|---|---|---|
| Based on | Lunar calendar, Five Elements | Solar calendar, planetary positions |
| Core unit | Day Master (Day Stem) | Sun Sign |
| Timing system | 10-year Major Luck Cycles | Planetary transits |
| Element system | Wood, Fire, Earth, Metal, Water | Fire, Earth, Air, Water |
| Animals | 12 Zodiac (yearly cycle) | 12 Signs (monthly cycle) |
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