What is BaZi

Origins — from one pillar to eight characters

Using stem-branch (Can Chi) pairs to read destiny is very old, but the system was thin at first. Tradition says Luo Lu Zi of the Tang dynasty relied only on the Year pillar — like taking a pulse at a single point: enough to sense a direction, not enough to reconstruct the whole configuration.

Li Xuzhong — three pillars, six characters

Li Xuzhong (761–813), Imperial Censor of the Palace in the Tang dynasty, expanded the reading to year · month · day. Han Yu recorded in Li Gong Mu Zhi Ming (Epitaph for Lord Li) that he took the stem-branch at birth, weighed generation, conquest, strength and decline, then inferred longevity, rank, and station — “not wrong one or two times in a hundred.” The Year pillar was still the center; the Hour pillar had not yet entered the system.

Xu Ziping — four pillars, the Day Master as commander

Around the tenth century, Xu Juyi (courtesy name Ziping) added the Hour pillar and reversed the emphasis: the day stem became the Day Master — the axis of every reading. Li Xuzhong built the frame; Ziping made that frame a house one could live in. Hence the system is called Zi Ping destiny study. Yuan Hai Zi Ping (Sea of Origins of Zi Ping; compiled in the Song, edited in the Ming) is still the primer in use today.

Zi Wei Dou Shu later kept adding stars. Four Pillars went the other way: only eight characters plus Five Phases generation and conquest. Few variables, no less depth — like Go with two colors of stone and inexhaustible play.

Chart structure — four pillars, eight characters

The chart is built from the solar date and time, converted to stem-branch by solar terms. Each pillar has one stem above and one branch below. Four pillars times two = eight characters — that is Bazi.

The Day Master (the day stem) is the sun of the configuration: every remaining stem-branch is read through generation · conquest · same or different Yin-Yang relative to it. If the Day Master is Jia, Water that generates it is resource, Fire it generates is output, Metal that conquers it is officer/kill.

Age stages are an old mnemonic — a way to remember each pillar’s layer of life, not a rigid calendar cut.

Hidden Stems in the Earthly Branches

An Earthly Branch is not a single exposed element. Inside it hide from one to three Heavenly Stems — Hidden Stems, also called the human origin within the branch. The exposed stem is the water’s surface; the hidden stems show the true Five Phases force in the pillar.

Zi, Mao, and You are pure qi — one stem, concentrated force. Chou, Chen, Wei, and Xu (the four tombs) hide three stems: storehouses where several currents meet and easily transform.

Ten Gods — ten relations around the Day Master

The eight characters are the bones. The Ten Gods are the nerves: each stem (and Hidden Stem) is named by its Five Phases relation to the Day Master, then split by same or different Yin-Yang. Wealth, officer, resource, output, and companion all appear from that.

Each god has two faces. Seven Killings under control of Eating God becomes authority; uncontrolled, it becomes oppression. Zi Ping Zhen Quan says mixed officer and kill is not a problem because kill is present, but because the configuration is turbid or clear — it prefers purity and dislikes disorder.

A quick mnemonic: five generation–conquest relations × two Yin-Yang poles = ten. Same Yin-Yang is often called “indirect”; different Yin-Yang is called “direct” (compliant, with ritual). Direct Officer is lawful pressure; Seven Killings is a head-on confrontation.

Luck cycles — Luck Pillars, Annual Pillar, Minor Luck

The eight characters are the innate climate. A Luck Pillar is a season on a ten-year beat — which element is activated, which is suppressed. The same Bazi, a different Luck Pillar direction, and the life is not the same.

How Luck Pillars are taken

The starting point is the Month pillar. A male born in a yang year or a female born in a yin year: forward, counting stem-branch onward. A male in a yin year or a female in a yang year: reverse, counting backward.

Age at onset: count the days from birth to the nearest solar term in the forward or reverse direction, then divide by three. For example, twenty-one days means the first Luck Pillar begins around age seven. The app calculates this when the chart is cast — no need to count by hand.

Annual Pillar and Minor Luck

The Annual Pillar is the stem-branch of the year being lived, changing each year. Minor Luck fills the stretch before the Luck Pillars begin. Three layers stack on the original Bazi: weather (the year) inside a season (Luck Pillar) upon a climate (the eight characters).

When a Luck Pillar or Annual Pillar carries the Useful God, the period runs smoothly; when it carries the Unfavorable God, it is hard. Clash and punishment that knock the Favorable and Useful Gods out of the chart invite upheaval. Years of rise and years of setback are not random — the stem-branch of time is touching the stem-branch of birth.

Useful God — the balance weight of the chart

The Useful God is the element chosen to balance the whole chart. A wrong Useful God sends every reading off course. Beside it: the Favorable God supports the Useful God; the Unfavorable God harms it; the Enemy God generates the Unfavorable God; the Idle God stands outside the contest.

Di Tian Sui asks: how does one know a wealthy person? Wealth qi has an open door. When the wealth element (if it is Useful or Favorable) can travel and is not broken, prosperity arrives of itself. Only after the Useful God is known does one speak of profession, direction, and color — the place where Zi Ping meets feng shui and the other arts.

The Useful God is not fixed for life. When the Luck Pillar changes, the Five Phases equation shifts, and the pivotal element may turn. That is why some people fit technique (Metal) for half a life, then grow strong in teaching and writing (Wood) in the second half.

Where it is used

Four Pillars is a shared language of many East Asian arts, not an island standing alone.

In the app: casting a chart is free; detailed interpretation unlocks per chart. The Study tab goes deeper into stem-branch, the Ten Gods, patterns, and the Useful God.

Where Four Pillars differs from Zi Wei Dou Shu

The two arts are often treated as the same. Their philosophy and method of reading are not alike; many people use them in parallel: Four Pillars takes elemental nature and the Useful God; Zi Wei Dou Shu takes events through star images.

Four common misunderstandings

“Metal / Wood destiny” is not necessarily Four Pillars

The street phrase “Metal destiny” is usually Na Yin by birth year — a different system. In Zi Ping, destiny is read from the Day Master. Two people of the same year Geng-Wu may have entirely different Day Masters. Confusing Na Yin with the Day Master is the most common error.

A missing element does not mean that element must be supplemented

Missing Fire while a Metal Day Master is already strong — Fire conquers Metal, and pouring in more Fire can harm. The rule: supplement the Useful God, not the empty slot for its own sake. The Useful God may be an element already present but weak, or an element that is absent yet needed for balance.

The birth year alone is not a chart

The year is only one quarter. The same year yields hundreds of thousands of combinations because month, day, and hour each have their own stem-branch. Losing the hour loses two of eight characters — the children pillar, later luck, and the Luck Pillar direction all become unstable.

Bazi is not a death sentence

The eight characters speak of tendencies and potential; they do not lock a life. Once the Useful God is known, profession, direction, color, and way of living still have room to turn. Liao Fan Si Xun (Liao Fan’s Four Lessons): destiny is made by us; blessing is sought by us. The aim is to live in accord, not to submit.

Quick questions

Are Four Pillars and Bazi different?

No. Four Pillars stresses the four columns; Bazi stresses the eight characters. Zi Ping, Zi Ping Bazi, BaZi, Four Pillars of Destiny — the same system.

What is needed to cast a chart?

Day, month, year, and hour of birth — the closer the better. Being off by one hour can change the Hour pillar and, with it, the Ten Gods and Luck Pillars. If the hour is unknown the chart can still be cast, but the later-luck layer is thinner.

Lunar or solar calendar?

Pillars are placed by solar terms on the solar calendar, not by the first day of the lunar month. The Zi Ping year changes at Start of Spring; months follow the twelve principal terms. This is the point of difference from Zi Wei Dou Shu (placed by the lunar calendar).

How many combinations are there?

In theory 60 years × 12 months × 60 days × 12 hours = 518,400. The month stem is bound to the year stem, and the hour stem to the day stem, so not every combination appears. Male and female Luck Pillars run forward or reverse differently, so the same eight characters still have two luck directions.

How does it differ from numerology?

Numerology has Pythagorean roots and reduces solar-calendar numbers. Four Pillars is Chinese in origin: stem-branch, Five Phases, solar terms. Same birth date, two languages, two philosophies — they do not replace each other.

Why do lives differ on the same birth date?

Gender reverses the Luck Pillar direction. Birth hour, time zone, and how far a person uses the Useful God also differ. The old saying: first destiny, second luck, third feng shui — the eight characters are only the first layer.

Where should study begin?

Stem-branch and Five Phases → Ten Gods → Useful God → read Yuan Hai Zi Ping or Ming Li Tan Yuan → cast many real charts. In the app, the Study tab follows that order.