Ba Zi Day Master guide · 4 of 10

Yin Fire: The Candle Flame

Ding (丁), the fourth of the ten Heavenly Stems.

4 min read · 7 November 2026
The short answer

Ding (丁) is Yin Fire. Its classical image is a candle, a lamp or starlight: a small, focused flame that burns brightest in the dark. People born on a Ding day are traditionally read as thoughtful, intuitive and quietly intense, with a gift for insight and devotion.

The imageThe Candle Flame

The sun lights the whole sky, but it can't help you read a book at midnight. For that you need a candle: a small, steady flame that you can carry into a dark room, hold close to a page, or set in a window so someone can find their way home.

That's Ding. Its light is personal rather than public. It illuminates one thing at a time, deeply, and it keeps burning long after the sun has gone.

StrengthsWhat Yin Fire brings

InsightA candle shows detail. Ding is traditionally perceptive, the one who sees what's really going on.
DevotionA lamp keeps vigil. Ding is loyal and caring, especially to the few people it lets close.
FocusA small flame, concentrated. Ding can work on one thing with remarkable intensity.
Inner lightDing is often spiritual, artistic or philosophical, a light that comes from within.

The shadowWhere Yin Fire gets stuck

A candle flickers in the wind. Ding's trap is sensitivity and worry: mood swings, overthinking, taking small slights deeply to heart, and burning quietly at both ends. And because it is a small flame, Ding sometimes underestimates its own power, until it starts a fire.

In loveYin Fire in relationships

In love, Ding is tender, attentive and deeply devoted, the partner who remembers the small things and makes the evening glow. It needs emotional safety. The growth edge is steadiness: sharing worries before they flare, and trusting that the light won't go out if you rest.

At workYin Fire and career

Ding excels in focused, meaningful work: research, writing, design, counselling, craft, invention, teaching small groups. It may not seek the spotlight, but its work often becomes the light others steer by. It struggles in chaotic, noisy environments that scatter its focus.

BalanceWhat helps Yin Fire thrive

Classically, a candle needs fuel: Yang Wood (甲), the great tree, is Ding's firewood, symbolising learning, support and mentors who keep the flame going. A still room (stable Earth) protects it from wind. Too much Water puts it out. Ding's ideal balance, as always, depends on the whole chart.

How it connectsYin Fire and the five elements

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

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

Its natural partner among the ten stems is Yang Water (壬 Ren). The two stems "combine," which is traditionally read as an attraction, though real compatibility always depends on both full charts.

Born on a Ding dayFamous Yin Fire Day Masters

Thomas Edison, the man who brought electric light into ordinary homes, was born on a Ding day, the day of the lamp.

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 Ding Fire mean in Ba Zi?

Ding (丁) is Yin Fire, the fourth Heavenly Stem. Its image is a candle, lamp or starlight, traditionally linked with insight, devotion, focus and inner light.

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 Yin Fire?

In Ba Zi, each stem has one "combination" partner. Ding (丁) combines with Ren (壬, Yang Water), 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.