Ba Zi Day Master guide · 1 of 10

Yang Wood: The Great Tree

Jia (甲), the first of the ten Heavenly Stems.

4 min read · 7 November 2026
The short answer

Jia (甲) is Yang Wood, the first of the ten Heavenly Stems. Its classical image is a tall tree: upright, principled, growing steadily toward the light. People born on a Jia day are traditionally read as natural leaders with strong values, a protective streak and a stubborn refusal to bend.

The imageThe Great Tree

Picture an old pine on a hillside. It doesn't move to suit the weather. Its roots go deep, its trunk grows straight, and every year it is a little taller than the year before. Birds nest in it. Travellers shelter under it. And when the storm comes, it would rather break than bow.

That's Jia. Of the ten Day Masters, it is the one most often described as a pillar: the friend everyone leans on, the colleague who starts the project, the person who says what they believe and then keeps standing there.

StrengthsWhat Yang Wood brings

DirectionJia grows one way: up. You tend to know what you stand for, and you keep moving toward it long after others have drifted.
ProtectionA tree gives shade. Jia people are often the ones who look after the group, defend the underdog and keep promises.
Starting thingsAs the first stem, Jia is the beginning of the cycle. Traditionally it's the energy of new projects, first steps and fresh starts.
IntegrityStraight grain. Jia is famous for honesty, sometimes uncomfortably so.

The shadowWhere Yang Wood gets stuck

The same trunk that won't bend in a storm can't bend in a conversation either. Jia's classic trap is rigidity: being right instead of being close, mistaking stubbornness for principle, and finding it hard to ask for help, because pillars aren't supposed to need holding up. A tree that never sways eventually snaps.

In loveYang Wood in relationships

In love, Jia is loyal, protective and steady, the partner who turns up. You may show care by doing rather than saying: fixing, providing, planning. The growth edge is softness. Partners of Jia sometimes say they feel looked after but not always heard. The relationship flourishes when the tree learns to sway a little.

At workYang Wood and career

Jia does well where there's something to build and a direction to hold: founders, team leads, teachers, advocates, architects of long projects. It struggles in roles that demand constant compromise or office politics. Give Jia a mission and room to grow, and it will outlast everyone.

BalanceWhat helps Yang Wood thrive

In the classical texts, a great tree is at its best when it is shaped and warmed. Metal (庚, the axe) carves it into something useful: discipline, structure, honest feedback. Fire (丙, the sun) brings out its blossom: warmth, expression, joy. Water nourishes it, but too much rots the roots: endless comfort or overthinking can stall Jia. Whether your Wood is strong or weak, and which elements truly help you, depends on your whole chart, especially your birth month.

How it connectsYang Wood and the five elements

In Ba Zi, every element feeds one element and controls another. From the point of view of a Yang Wood Day Master, here's what each element represents:

Same element · CompanionWood: friends, siblings, peers, and rivals. Support, and competition.
Feeds you · ResourceWater: learning, mentors, rest, the people and habits that nourish you.
You feed · OutputFire: your creativity, expression and what you give to the world.
You control · WealthEarth: what you work on and earn from. Money, tasks, results.
Controls you · PowerMetal: discipline, authority, rules and pressure. It shapes you, or wears you down.

Its natural partner among the ten stems is Yin Earth (己 Ji). The two stems "combine," which is traditionally read as an attraction, though real compatibility always depends on both full charts.

Born on a Jia dayFamous Yang Wood Day Masters

Both Brontë sisters were born on Jia days, two straight-grained writers who refused to soften their heroines for anyone.

Calculated by SkyConfluence from documented birth dates. Birth times aren't known, so these are by calendar date.

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FAQQuick questions

What does Jia Wood mean in Ba Zi?

Jia (甲) is Yang Wood, the first Heavenly Stem. Its image is a tall tree, and it's traditionally linked with leadership, principle, growth and protectiveness.

How do I find my Day Master?

Your Day Master is the Heavenly Stem of the day you were born, taken from the 60-day cycle used in Chinese calendars. You can calculate it from your date of birth with the free calculator on SkyConfluence's Day Master page.

Which Day Master pairs with Yang Wood?

In Ba Zi, each stem has one "combination" partner. Jia (甲) combines with Ji (己, Yin Earth), traditionally read as a natural attraction. Real compatibility depends on both full charts, not one stem.

All tenThe other Day Masters

甲Yang Wood乙Yin Wood丙Yang Fire丁Yin Fire戊Yang Earth己Yin Earth庚Yang Metal辛Yin Metal壬Yang Water癸Yin Water
Sources and notes Imagery follows the classical Ba Zi tradition, including the Di Tian Sui (滴天髓) and the Qiong Tong Bao Jian (穷通宝鉴), retold in plain English. Background: Heavenly Stems, Four Pillars of Destiny. Famous examples: day pillars calculated by SkyConfluence from documented birth dates (Gregorian calendar, by calendar date; birth times are not known, so a late-evening birth could fall on the next day in some schools). Ba Zi is a traditional system of symbolism, offered for reflection and entertainment, not prediction.