Glossary

How BaZi works

Four Pillars of Destiny: a calendar system, read from eight characters and the balance of five elements between them.

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There are no planets in it

Ba Zi turns a birth moment into four pairs of characters, one pair each for the year, month, day and hour, taken from a repeating calendar. Eight characters in total, which is what Ba Zi means. It measures something different from a Western chart, so the two can describe the same person without contradicting each other.

The Day Master is you

Of the eight characters, the stem on top of the day pillar stands for you. Everything else is read against it: whether the chart is strong or weak, which elements it needs and what the Ten Gods mean. Ask a Ba Zi reader for your sign and "yin Fire" is a more likely answer than "Dragon".

The year turns at Li Chun

The Ba Zi year starts at the solar term Li Chun, around February 4. Chinese New Year is lunar and moves between late January and late February, so it is the wrong boundary here. A late-January birth often belongs to the previous Ba Zi year, the most common reason people have used the wrong animal for years.

Months run on solar terms

Ba Zi months start on twelve of the twenty-four solar terms, never on the 1st of a calendar month or on a new moon. The boundaries land around the 4th to the 8th of a Western month, which is why the month pillar cannot be read off a date and why those dates barely move from year to year.

The hour pillar is the fragile one

The day splits into twelve double-hours. The first, zi, runs from 23:00 to 01:00 and crosses midnight, and schools disagree about which day a birth in that window belongs to. Clock time can also differ from true solar time by over an hour near the edge of a wide time zone, so a birth near a boundary needs care.

Luck pillars move, the chart does not

Ba Zi timing runs in ten-year periods worked out from the month pillar. Each one adds its own stem and branch to your eight characters, so a chart short of Fire feels different in a Fire decade than in a Water one. The chart stays the same; what it stands in changes.

The pillars

Four Pillars

Ba Zi reads your birth as four pairs of characters: year, month, day and hour. Eight characters in total.

What it is: Ba Zi turns your birth moment into four pillars, one each for the year, month, day and hour. Each pillar is a Heavenly Stem on top of an Earthly Branch, and Ba Zi means "eight characters".
What it stands for: Ba Zi reads the pillars as layers of a life: the year as family and early years, the month as parents and career, the day as you and your partner, and the hour as children and later life.
Why it matters: The four pillars are the whole chart, and everything else is read from how the characters relate. It is built from a calendar, so it does not care where any planet was.
Try it: Open "Your Chinese sign, properly calculated" and find your day pillar. Its top character is you, so read that element’s entry in this glossary before anything else.
Common mistake: Looking for planets. Ba Zi is a calendar system, which is why it can describe the same person as a Western chart without ever contradicting it.

Day Master

The top character of your day pillar. In Ba Zi this is you, and everything else is read in relation to it.

What it is: The Heavenly Stem on your day pillar. It is one of ten, each being one of the five elements in a yang or a yin form, such as yang Wood or yin Water.
What it stands for: Ba Zi reads the Day Master as your core nature through an image from nature. Yang Wood is a tall tree that grows straight up, while yin Wood is a vine that finds its way around obstacles.
Why it matters: Every other character is read against it. Whether the chart counts as strong or weak, what it needs more of and what the Ten Gods mean all start from the Day Master.
Try it: Find your Day Master on your Ba Zi chart and read its element entry below. Pick the one line that fits you best and write down a time this year it showed.
Common mistake: Expecting it to be your year animal. The year branch is one character of eight, and a Ba Zi reader will tell you "yin Fire" long before "Dragon".

Day Master strength

Whether your Day Master gets more support than pressure from the rest of the chart. It decides what you need.

What it is: The reading weighs how many characters support your Day Master, by being its element or feeding it, against how many drain or control it. The season of your birth month counts the most.
What it stands for: Ba Zi reads a strong Day Master as someone with plenty of drive who needs an outlet, and a weak one as someone who does best with support and allies around them.
Why it matters: It flips the advice. A strong chart benefits from the elements that spend and control it, while a weak chart benefits from the ones that feed it.
Try it: Open "Whether your Day Master is strong or weak". If strong, give it one outlet this week, like a hard workout or a new project; if weak, ask for help with one task you would normally do alone.
Common mistake: Thinking strong is good and weak is bad. Both are balances to manage, and plenty of successful people have weak Day Masters and great teams.

Heavenly Stem

One of ten characters: the five elements, each in a yang and a yin form. The top half of every pillar.

What it is: The ten stems are Jia and Yi (Wood), Bing and Ding (Fire), Wu and Ji (Earth), Geng and Xin (Metal), and Ren and Gui (Water), the first of each pair yang and the second yin. They pair with the twelve branches to make a sixty-step cycle.
What it stands for: Ba Zi reads each stem as an image from nature. Bing is the sun and Ding a candle, Ren the ocean and Gui the rain, so two Fire people can feel very different.
Why it matters: Stems are the visible half of the chart, what a person shows and is seen doing. The way they feed and control one another is what turns eight characters into a reading.
Try it: Write down the four stems on top of your pillars and count how many are yang and how many yin. Compare it with whether you tend to push forward or adapt.
Common mistake: Treating the yin and yang forms of an element as the same. Yang Wood and yin Wood are both Wood, and they are as different as an oak and a vine.

Earthly Branch

One of twelve characters, the animals of the Chinese zodiac. The bottom half of every pillar.

What it is: Each pillar has an Earthly Branch under its stem, and there are twelve: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog and Pig. Each branch also holds one to three hidden stems.
What it stands for: Ba Zi reads the branches as the ground the stems stand on, each with a season and a direction. Branches also clash or combine: Rat and Horse sit opposite and clash, while some pairs merge and act as one.
Why it matters: The animal most people know is only the year branch, one character of eight. The day branch is the one that describes your partner and your private life.
Try it: Open "Where your pillars pull against each other" to see any clashes. For each one, write down the two life areas involved, like family and partner, and where they compete for your time.
Common mistake: Thinking "I am a Dragon" is a Ba Zi reading. That is only the year branch, and it changes at Li Chun in early February, never at Chinese New Year.

Hidden Stems

Every branch hides one to three stems inside it. They hold much of the detail in a Ba Zi chart.

What it is: Each Earthly Branch contains one to three Heavenly Stems in a fixed traditional pattern. The Tiger branch, for example, holds Wood, Fire and Earth, so one animal carries three elements underneath.
What it stands for: Ba Zi reads hidden stems as the private side of the chart: motives, resources and talents that are present but not on show.
Why it matters: Counting only the eight visible characters gives a thin and sometimes wrong picture of which elements a chart holds. The hidden stems are what make the element balance real.
Try it: Open "What your chart is hiding" and find an element that shows up only in hidden stems. Name one talent of that element you rarely show, and use it once this week.
Common mistake: Concluding a chart has no Fire because none of the eight characters is Fire. A chart with no obvious Fire can carry plenty of it inside its branches.

Ten Gods

The ten ways another character can relate to your Day Master: as support, output, wealth, authority or peer.

What it is: Each other stem in the chart either produces your Day Master, is produced by it, controls it, is controlled by it, or matches it. Split each of those five by yin and yang and you get ten.
What it stands for: Ba Zi reads them as the people and resources in your life. Resource is support and learning, Output is talent and expression, Wealth is what you manage, Officer is rules and pressure, and Companion is peers and rivals.
Why it matters: The Ten Gods turn element bookkeeping into human meaning. This is where the chart starts talking about money, work, ambition and relationships.
Try it: Open "How you relate to everything else" and find the god that appears most. Write down where that theme, such as Output or Wealth, takes up most of your week.
Common mistake: Reading the names literally. "Wealth" is a kind of relationship to the Day Master and no promise of money, and "Seven Killings" describes pressure rather than danger.

Five elements

Wood

The element of spring and growth. Wood people tend to plan, push upward and keep expanding.

What it is: Wood is one of the five Ba Zi elements. It is fed by Water, feeds Fire, and controls Earth, the way roots break up soil. Its stems are Jia (yang) and Yi (yin), and its season is spring.
What it stands for: Ba Zi reads Wood as growth, kindness, vision and the urge to improve. Yang Wood is the tall tree that stands firm and leads, while yin Wood is the vine or flower that bends, adapts and connects.
Why it matters: If Wood is your Day Master, growth and purpose drive you. If your chart has little Wood, planning ahead and steady growth take conscious effort.
Try it: Check your Wood level in "What you have too much and too little of". If it is low, set one goal for the next three months; if high, finish one plan before you start another.
Common mistake: Thinking Wood is always gentle. Yang Wood can be stubborn, and too much Wood pushes through other people’s boundaries like roots through a wall.

Fire

The element of summer and warmth. Fire people tend to be expressive, social and quick to light up.

What it is: Fire is fed by Wood, feeds Earth the way ash becomes soil, and controls Metal the way heat melts it. Its stems are Bing (yang) and Ding (yin), and its season is summer.
What it stands for: Ba Zi reads Fire as passion, joy, visibility and good manners. Yang Fire is the sun, warm to everyone at once, while yin Fire is the candle, warm up close and good at lighting the way for one person.
Why it matters: If Fire is your Day Master, you need to be seen and to feel enthusiasm. If your chart has little Fire, motivation and visibility need deliberate support.
Try it: Check your Fire level in "What you have too much and too little of". If it is low, do one thing that gets you seen this week; if high, plan one quiet evening to cool down.
Common mistake: Assuming Fire always means extrovert. Yin Fire people are often quiet and focused, and warm only with the people who come close.

Earth

The element of stability and the center. Earth people tend to be reliable, patient and protective.

What it is: Earth is fed by Fire, feeds Metal the way ore forms in the ground, and controls Water the way a dam holds a river. Its stems are Wu (yang) and Ji (yin), and it rules the turn between seasons.
What it stands for: Ba Zi reads Earth as trust, stability, care and holding things together. Yang Earth is the mountain, steady and hard to move, while yin Earth is garden soil, fertile and nurturing.
Why it matters: If Earth is your Day Master, people lean on you. If your chart has little Earth, routine and staying grounded take extra work.
Try it: Check your Earth level in "What you have too much and too little of". If it is low, keep one fixed daily routine for a week; if high, change one habit that has turned into a rut.
Common mistake: Reading Earth as boring. It is the element that makes the others usable, and Earth people are often the reason a project actually gets finished.

Metal

The element of autumn and precision. Metal people tend to be decisive, principled and sharp.

What it is: Metal is fed by Earth, feeds Water the way dew forms on cool metal, and controls Wood the way an axe cuts a tree. Its stems are Geng (yang) and Xin (yin), and its season is autumn.
What it stands for: Ba Zi reads Metal as justice, discipline, clarity and loyalty. Yang Metal is the raw blade or axe, blunt and strong, while yin Metal is jewelry, refined and quietly valuable.
Why it matters: If Metal is your Day Master, you need clear rules and you cut what does not work. If your chart has little Metal, firm decisions and clean endings are hard.
Try it: Check your Metal level in "What you have too much and too little of". If it is low, make one decision this week you have been circling; if high, let one rule bend for someone who needs it.
Common mistake: Seeing Metal as cold. Metal people are fiercely loyal once committed, and their bluntness usually comes from caring about what is right.

Water

The element of winter and depth. Water people tend to be clever, adaptable and good at reading others.

What it is: Water is fed by Metal, feeds Wood, and controls Fire the way water puts out a flame. Its stems are Ren (yang) and Gui (yin), and its season is winter.
What it stands for: Ba Zi reads Water as intelligence, communication, flexibility and wisdom. Yang Water is the ocean or a river, strong and always moving, while yin Water is rain and mist, gentle and hard to pin down.
Why it matters: If Water is your Day Master, you think in flows and connections. If your chart has little Water, rest, reflection and going with the flow take practice.
Try it: Check your Water level in "What you have too much and too little of". If it is low, block one hour to think with no agenda; if high, turn one idea you keep circling into a plan with a date.
Common mistake: Assuming Water is weak because it is soft. Water wears down stone, and Water people often win through patience and strategy.

Yin and yang

The two sides of every Ba Zi element: yang is outward and direct, yin is inward and adaptable.

What it is: Each of the five elements comes in a yang and a yin form, which gives the ten stems. The twelve branches are also yang or yin, alternating around the circle and starting with yang Rat.
What it stands for: Ba Zi reads yang as active, open and expanding, like noon, and yin as receptive, quiet and contained, like midnight. A yang Day Master tends to push forward, and a yin one tends to find a way around.
Why it matters: It decides how an element behaves. It also sets the direction of your luck pillars, which run forward or backward depending on your year stem and sex.
Try it: Check whether your Day Master is yang or yin. Think of your last hard problem, whether you pushed through it or went around it, and which way worked.
Common mistake: Equating yang with male and good and yin with female and bad. They are equal halves of one cycle, and every person and every chart has both.

Calendar and timing

Luck Pillar

A ten-year season in Ba Zi. Your chart stays fixed while each decade brings a new element into it.

What it is: A ten-year period worked out from your month pillar, running forward or backward through the calendar depending on your year stem and sex. Each one adds its own stem and branch to your eight characters.
What it stands for: Ba Zi reads each luck pillar as the weather your chart is standing in. A chart short of Fire tends to feel a Fire decade as warm and visible, and a Water decade as slower and cooler.
Why it matters: It is why the same chart reads differently by decade. The chart has not changed, but what surrounds it has.
Try it: Open "The decade you are in, and the ones ahead" to see your current luck pillar and when it ends. Write down what changed in your life around the last switch.
Common mistake: Expecting the change to land on a birthday. Luck pillars turn at their own calculated age, often between birthdays, and the change usually feels like a season shifting over a year or two.

Li Chun

The start of spring, around February 4. The Ba Zi year turns here, and Chinese New Year does not count.

What it is: The first of the twenty-four solar terms, around February 4, when the Sun reaches 315° of celestial longitude. It marks the start of spring in the Chinese solar calendar, and the Ba Zi year begins here.
Why it matters: It sets the year pillar for anyone born in January or early February. Chinese New Year is lunar and moves between late January and late February, so a late-January birth often belongs to the previous Ba Zi year.
Try it: If you were born between January 20 and February 20, check your year animal in "Your Chinese sign, properly calculated" and compare it with the one you have always used.
Common mistake: Using Chinese New Year to find your animal. It is the wrong boundary for Ba Zi, and it is the most common reason people have used the wrong animal for years.

Solar term

One of 24 divisions of the solar year. Ba Zi months start on them, so they rarely match calendar months.

What it is: The Chinese solar year splits into twenty-four parts of 15° of the Sun’s travel each, marking the equinoxes, the solstices and the start of each season. Twelve of them start the Ba Zi months.
Why it matters: Ba Zi months run from solar term to solar term, so a month boundary lands around the 4th to the 8th of a Western month. That is why the month pillar cannot be read off a calendar date alone.
Try it: If your birthday falls between the 3rd and the 8th of a month, check your month pillar here. Your birth may sit right on a solar term, so your exact birth time matters.
Common mistake: Assuming the Chinese calendar is purely lunar. Festivals follow the lunisolar calendar, but Ba Zi runs on the solar part, which is why its dates barely shift from year to year.

Zi hour

The double-hour from 11 p.m. to 1 a.m. It crosses midnight, so schools disagree about which day it belongs to.

What it is: The Chinese day splits into twelve double-hours named for the branches. Zi, the Rat hour, runs from 23:00 to 01:00; the half before midnight is called late zi and the half after it early zi. This app starts the new day at 23:00.
Why it matters: It decides the day pillar, and so the Day Master, for anyone born in that window. One school starts the new day at 23:00 and another at midnight, and the two give different charts.
Try it: If you were born between 11 p.m. and midnight, look up the Day Master for both possible days. Read both element entries and keep the one that fits you better as a working answer.
Common mistake: Assuming there is one agreed rule. It is a real disagreement between schools, and a good practitioner will tell you which convention they follow.