Heavenly Stems& Earthly Branches

To Read Saju, You Need These 22 Characters

In the previous guide (G1), we learned that Saju is built on Four Pillars and Eight Characters. But where do those eight characters come from?

The answer: 10 Heavenly Stems (천간, Cheongan) and 12 Earthly Branches (지지, Jiji) — 22 base characters in total. Think of them as the "alphabet" of Saju.

The 10 Heavenly Stems

The Heavenly Stems (천간) literally mean "pillars of heaven." They represent the energy flowing down from above. In Saju analysis, the Stems reveal your outward personality — the "you" that others see.

The 10 Stems are organized as Yin and Yang pairs across the Five Elements (Wood, Fire, Earth, Metal, Water):

Yang vs. Yin: Same Element, Different Energy

Even within the same element, Yang and Yin versions have distinct personalities. Yang is big, active, and outward-facing. Yin is subtle, refined, and inward-focused.

For example, both are Wood, but:

• Gap (甲, Yang Wood) = A towering tree — leadership, ambition, pioneering spirit
• Eul (乙, Yin Wood) = A vine or flower — adaptability, charm, emotional intelligence

And both are Fire, but:

• Byeong (丙, Yang Fire) = The Sun — bright energy, optimism, charisma
• Jeong (丁, Yin Fire) = A candle — focused intensity, insight, quiet warmth

10 Stems: Personality at a Glance

Stem	Element	Nature Image	Core Personality
Gap (甲)	Yang Wood	Tall tree, thunder	Ambitious, leader, pioneering
Eul (乙)	Yin Wood	Flower, vine	Flexible, adaptive, charming
Byeong (丙)	Yang Fire	The Sun	Bright, optimistic, energetic
Jeong (丁)	Yin Fire	Candle, moonlight	Insightful, focused, perceptive
Mu (戊)	Yang Earth	Mountain, ground	Steady, trustworthy, nurturing
Gi (己)	Yin Earth	Garden, farmland	Caring, detail-oriented, practical
Gyeong (庚)	Yang Metal	Rock, sword	Decisive, strong-willed, just
Sin (辛)	Yin Metal	Jewel, needle	Sharp, perfectionistic, aesthetic
Im (壬)	Yang Water	Ocean, river	Wise, inclusive, free-spirited
Gye (癸)	Yin Water	Dew, rain	Intuitive, sensitive, calm

The 12 Earthly Branches

The Earthly Branches (지지) mean "branches of the earth." They represent the energy patterns unfolding on the ground. You probably know them as the 12 zodiac animals — Rat, Ox, Tiger, and so on.

Branches are more complex than Stems. Each one encodes season, direction, and time of day simultaneously. In Saju, they represent your inner world, hidden emotions, and environmental influences.

What Each Branch Encodes

• Element: One of the Five Elements (+ Yin or Yang)
• Season: Spring (In, Myo, Jin) → Summer (Sa, O, Mi) → Autumn (Sin, Yu, Sul) → Winter (Hae, Ja, Chuk)
• Direction: 8 compass directions
• Time: Day divided into 12 two-hour blocks
• Animal: The 12 zodiac animals (Rat through Pig)

The 60-Year Cycle (Sexagenary Cycle)

When the 10 Stems and 12 Branches pair up in sequence, they create 60 unique combinations. This is called the Sexagenary Cycle (육십갑자, Yuksip Gapja).

The first pair is Gap (甲) + Ja (子) = Gap-Ja. The second is Eul (乙) + Chuk (丑) = Eul-Chuk. This continues until the 60th pair, Gye (癸) + Hae (亥) = Gye-Hae, and then the cycle restarts.

Ever heard of "Hwangap" (환갑)? It's the Korean celebration of a person's 60th birthday — because that's when your birth year's Stem-Branch combination comes back around for the first time.

Stems vs. Branches: Different Roles

Aspect	Heavenly Stems	Earthly Branches
Meaning	Heaven's energy	Earth's energy
Count	10	12
Reveals	Outward personality	Inner world, hidden traits
Data density	Element + Yin/Yang	Element + Yin/Yang + Season + Direction + Time
Analogy	Your signboard, first impression	Your roots, true feelings
In analysis	Will, action style	Environment, emotions, relationships

Element Colors at a Glance

Each element has a traditional color that's often used in Saju charts:

• Wood = Green/Blue — Gap, Eul / In, Myo
• Fire = Red — Byeong, Jeong / Sa, O
• Earth = Yellow — Mu, Gi / Jin, Mi, Sul, Chuk
• Metal = White/Silver — Gyeong, Sin / Sin, Yu
• Water = Black/Blue — Im, Gye / Hae, Ja

Advanced: Hapchunghyeongpahae — How Characters Interact

You've now learned all 10 Heavenly Stems and 12 Earthly Branches. But these characters don't exist in isolation — they attract, clash, grind against, break apart, and undermine each other. These five types of interaction are collectively called Hapchunghyeongpahae (合沖刑破害) in Korean astrology. They explain how the fixed characters in your birth chart shift dynamically as the flow of fortune changes over time.

Hap (合) — Combination & Creation

Hap means characters are drawn together and bound into a union. Old interpretations treated all combinations as automatically lucky, but modern Saju analysis recognizes that the outcome depends on the overall balance of the chart.

Heavenly Stem Combinations (Cheongan-hap)

Combination	Pair	Transforms into
Gap-Gi	甲 + 己	Earth
Eul-Gyeong	乙 + 庚	Metal
Byeong-Sin	丙 + 辛	Water
Jeong-Im	丁 + 壬	Wood
Mu-Gye	戊 + 癸	Fire

Each Yang Stem pairs with a Yin Stem. When conditions are right, the pair can transform into an entirely new element — or simply lock each other's energy in place without transforming.

Earthly Branch Combinations (Jiji-hap)

Branch combinations come in three types:

• Directional Combination (Banghap) — Branches sharing the same season/direction unite. In-Myo-Jin (East/Spring), Sa-O-Mi (South/Summer), Sin-Yu-Sul (West/Autumn), Hae-Ja-Chuk (North/Winter). Like a family bond — powerful but sometimes inflexible.
• Three-Way Combination (Samhap) — Branches unite around a shared purpose. Sin-Ja-Jin (Water), Hae-Myo-Mi (Wood), In-O-Sul (Fire), Sa-Yu-Chuk (Metal). Different energies converging toward a strong, goal-oriented force.
• Six Pairings (Yukhap) — One-on-one bonds. Ja-Chuk, In-Hae, Myo-Sul, Jin-Yu, Sa-Sin, O-Mi. Like a close partnership or marriage — deeply personal and tightly bound.

Chung (沖) — Clash & Change

Chung is the collision of directly opposing energies. "Clash = always bad" is a misconception — a clash acts as a catalyst for change.

• Positive clash: Stuck situations unblock; new beginnings like career moves, relocations, or pregnancies may occur.
• Negative clash: Destruction, separation, or health issues can arise.

The outcome hinges on the relative strength of the energies involved. When a strong energy clashes with a weak one, the weak is uprooted. When a weak energy clashes with a strong one, the strong energy is actually activated further.

Stem clashes tend to drive mental or ideological shifts, while Branch clashes tend to trigger real-world events.

Hyeong (刑) — Sustained Friction

Unlike a sudden clash, Hyeong is a slow, grinding friction — persistent tension and adjustment over time. It can manifest as legal troubles, surgeries, psychological stress, or interpersonal conflict.

• In-Sa-Sin (寅巳申) — "Punishment of ingratitude." Three-way friction among Tiger, Snake, and Monkey.
• Chuk-Sul-Mi (丑戌未) — "Punishment of relying on power." Ox, Dog, and Goat in tension.
• Self-punishment (Jahyeong) — When the same branch appears twice (e.g., Jin-Jin, O-O), creating internal conflict.

Interestingly, when Hyeong manifests positively, it empowers people in medicine, law, military, and law enforcement — professions that deal with life-and-death decisions or authority. Hyeong applies only to Branches, not to Stems.

Pa (破) & Hae (害) — Breaking & Undermining

Pa (破, Break) disrupts the core energy of a Three-Way Combination. It shows up as plans falling through or relationships fracturing. For example, in the Sin-Ja-Jin (Water) trio, the pivotal Ja (子) is broken when it meets Yu (酉).

Hae (害, Harm) interferes with the Six Pairings (Yukhap) bond. It breeds jealousy, sabotage, or emotional distance — which is why it's also called Yukhae (Six Harms).

Next Up: Why Birth Time Matters

Now you know all 22 base characters of Saju. In the next guide, we'll tackle a question many people ask: "Does birth time really matter?" We'll cover midnight boundary issues, true solar time correction, and daylight saving time — all the details that make the difference between an accurate and inaccurate Saju reading.