八字
Chinese personality code
The Four Pillars of Destiny from your date and time of birth: your 日主, element balance and core energy.
Methodology
What is 八字 (BaZi)?
八字
BaZi (八字, “eight characters”) is a classical Chinese system that records the moment of birth as four pairs of calendar characters. Below we explain how the chart is built, how we calculate it and how to read the result with respect for the tradition and without magical thinking.
History and meaning of the Four Pillars
The method took shape during the Tang and Song dynasties, and the master Xu Ziping (徐子平) made the day of birth the centre of analysis, which is why BaZi is also called Ziping astrology. Each of the four pillars (四柱) — year, month, day and hour — combines a Heavenly Stem (天干) and an Earthly Branch (地支). There are ten stems and twelve branches, and their pairings form the sixty-unit cycle that China used for centuries to count days and years. In China this is living culture: people still consult BaZi when choosing a wedding date or the day to open a business.
Stems, branches and the Day Master
Every stem and branch belongs to one of the five elements — wood, fire, earth, metal or water — and has yin or yang polarity. The stem of the day pillar is the Day Master (日主), which represents the person; everything else is read through its relationship to it. One important detail: the BaZi year begins not at Chinese New Year but at the solar term Lichun (立春, around February 4), and months follow the solar terms 节气, not lunar months. Someone born on February 1 therefore belongs to the previous year in their chart, even if the lunar new year has already passed.
How we calculate: the method in plain words
Calendar conversion is done by lunar-javascript, a well-tested open-source library under the MIT licence. Your birth time is first converted using the time zone of your birthplace, and if the city is known we use true solar time — a correction for longitude plus the equation of time — for the day and hour pillars. We follow the late Zi hour convention (晚子时): between 23:00 and 00:00 the hour is already Rat, but the day pillar does not change yet. The element balance counts visible stems and the hidden stems inside branches (藏干), with the month branch weighted 1.5× because the season of birth is the strongest factor in classical theory; if your birth time is unknown, we build three pillars.
How to use the result wisely
Treat the chart as a cultural language for describing temperament, not as a verdict or a forecast. It works best as a prompt for reflection: which qualities are strong in you, what is missing, how you respond under pressure. If you work with Chinese partners, knowing your chart is a friendly bridge — many people in China will appreciate that you know what a 日主 is. Decisions about health, money and relationships should rest on facts, not on eight characters.
Questions
Do I need an exact birth time?+
It helps: the hour determines the fourth pillar and part of the element balance. Without it we build three pillars — year, month and day — and your Day Master is still correct.
Why is my year animal different from the usual Chinese zodiac?+
Popular zodiac sites switch animals at Chinese New Year, while BaZi switches at Lichun, around February 4. For people born in January or early February the results can differ, and that is not an error.
Why do you ask for my birthplace?+
The city gives us the time zone and true solar time. The gap between clock time and the sun’s actual position can reach an hour or more, which sometimes changes the hour pillar.
Is BaZi scientific?+
No. It is part of China’s cultural heritage, built on the calendar and classical natural philosophy rather than testable evidence. We calculate the chart precisely by the rules of the tradition, but the interpretation remains symbolic.