The Chinese astrology library
The Four Pillars (BaZi)
Eight characters, one chart
Your Chinese zodiac animal is only the beginning. The full system, called BaZi or the Four Pillars, writes your birth year, month, day and hour as eight characters: a Heavenly Stem and an Earthly Branch for each. Together they form one chart, and this guide shows you how to read its shape and how to find your own.
Raise your four pillars, freeEight characters, four pillars
BaZi means "eight characters." It writes down the moment you were born in the traditional Chinese calendar, using four columns: year, month, day and hour. Each column holds two characters stacked one above the other, and that upright pair is what people call a pillar.
The top character is a Heavenly Stem, one of ten. Each stem is an element in its yang or yin form. Jia is yang wood, the great tree, while Yi is yin wood, the flowering vine. The bottom character is an Earthly Branch, one of twelve, and this is where the animals live. Zi is the Rat, Wu is the Horse, Hai is the Pig, and each branch carries an element of its own too.
So the animal you already know is simply the branch of your year pillar. It is real, but it is one character out of eight, a bit like knowing someone's hometown and nothing else about them. Two people born in the same Dragon year can end up with very different charts once the month, day and hour fill in.
What each pillar speaks to
In classical practice, each pillar is tied to an area of your life. The year pillar speaks of ancestry, your early surroundings and the face you show the wider world. The month pillar covers parents, upbringing and the climate of your working life. It also sets the season you were born into, which is why this site counts the month double when it weighs the strength of your Day Master.
The day pillar is you and your closest partnership. Its stem is your Day Master, the character the whole chart is read around. If your day stem is Bing, yang fire, you are pictured as the sun. If it is Gui, yin water, you are the still lake. The hour pillar holds children, later years and the inner life, and its branch is your secret animal, the one most people never hear about.
Treat these as themes and tendencies, not verdicts. A reader looks at how the four pillars lean on, feed and push against one another, and that balance carries more weight than any single character.
How to raise your chart
Turning a Western birth date into four pillars takes real astronomy. The year turns at Lichun, when the Sun reaches 315 degrees, around February 4, not on January 1. Someone born in late January or the first days of February can belong to the previous animal. The months turn at the twelve jie solar terms, one every 30 degrees from there.
The day and hour are set by true solar time at your birthplace. The calculation removes any daylight saving, adds or subtracts 4 minutes for every degree you sit from your time zone's centre line, and applies the equation of time, which can shift things by up to about 16 minutes. A clock time close to the edge of a two-hour block can therefore land on the neighboring animal.
Our free BaZi calculator does all of this for you and shows every stem and branch. If you don't know your birth time, you get no hour pillar, and a year or month pillar that changed on your birth day appears as "X or Y." From there, the elements page reads what your mix of wood, fire, earth, metal and water is doing.
Keep learning
The rest of the library: five short guides to the Four Pillars.
The Heavenly StemsThe ten Heavenly Stems, from great tree to still lake, and how they sit in your chart.
The Earthly BranchesThe twelve Earthly Branches: the animals, their elements, their friendships and clashes, and the hours they keep.
The Day MasterThe one stem in your BaZi chart that stands for you, and the ten forms it takes.
Yin & YangHow yin and yang double the five elements, split the twelve animals, and color your Day Master.
Lichun — the Solar New YearWhy your Chinese animal year turns at Lichun in early February, not January 1 or the festival.
See it in your chart
Your four pillars, cast from the exact moment of your birth with the hour read by the Sun, your Day Master and your five elements, with a written reading free. It works even if you don’t know your birth time.
Raise my four pillarsThe Four Pillars (BaZi), answered
Is BaZi the same as my Chinese zodiac animal?
Not quite. Your zodiac animal is one piece of BaZi: the Earthly Branch of your year pillar. The full chart adds seven more characters across the year stem and the month, day and hour pillars. That is why two people born in the same animal year can have strikingly different charts, with different Day Masters, different element balances and different secret animals.
Do I need my birth time for a BaZi chart?
You can still get the year, month and day pillars without it. The hour pillar, and with it your secret animal, needs your birth time, at least roughly, since the hours run in two-hour blocks read by true solar time. Without a time there is no hour pillar, and if the year or month changed on your birth day, the calculator shows both possibilities as "X or Y."
What does a BaZi reading actually tell you?
A classical reading looks at temperament, relationships, work and timing, all through one lens: how your eight characters balance the five elements around your Day Master. It notices which elements are strong, which are thin, and which ones help. It describes tendencies and seasons in a life rather than a fixed script, and it makes no promises about what will happen.
Why is BaZi called the Four Pillars of Destiny?
Each part of your birth moment, the year, month, day and hour, is written as a two-character column, with a Heavenly Stem on top and an Earthly Branch below. Set side by side, those four upright columns look like pillars holding up the chart. Four pillars, eight characters, one chart: the name simply describes what is on the page.
Explore every tool
Every free reading, chart and calculator on the site, gathered here so you can find yours.