Enter your birth date and time. The classical method derives your Four Pillars, your Day Master, and the balance of five elements in your chart — presented as a lens for reflection, never a verdict on your future.
BaZi, literally "Eight Characters", is a classical Chinese astrological system that maps a person's birth moment onto four pairs of stems and branches — the Four Pillars. Each pillar represents one of four dimensions of birth: year, month, day, and hour. The Day Pillar's heavenly stem is the "Day Master" (日主), which stands for the person at the centre of the chart. From these eight characters, the classical method derives relationships among the Five Elements (Wood, Fire, Earth, Metal, Water), the Ten Gods (十神), hidden stems within each branch, and a sequence of Da Yun (大运) phases that mark ten-year rhythms across life.
The system has been used for over a thousand years across East Asia — in China, Korea, Japan, and Vietnam. Unlike Western astrology which is based on the twelve zodiac constellations, BaZi uses the sexagenary cycle of sixty stem-branch combinations. Each stem carries one of the five elements and a yin or yang quality, and each branch contains hidden stems that add depth to the reading. The result is a structured symbolic map that many people use as a tool for self-reflection, communication, and planning.
The Year Pillar is anchored to Lichun (立春, the Start of Spring solar term), not the Gregorian New Year. The Month Pillar is derived from the solar term nearest the birth date — each month begins at a "Jie" (节) rather than on the 1st. The Day Pillar is calculated from a fixed day-count reference. The Hour Pillar is derived from the Day Stem and the two-hour branch of the birth time. This calculator follows the standard deterministic rules used in mainstream BaZi practice, so the same birth data always produces the same chart.
Your BaZi profile shows: the four pillar cards with their stem-branch pairs, hidden stems, Ten God associations, and Na Yin (纳音) element tones; your Day Master element and its yin-yang quality; a five-element balance bar; which elements the classical method reads as supporting vs. challenging the Day Master; decorative stars (Shen Sha) such as Nobleman, Traveling Horse, and Peach Blossom; and a Da Yun table listing eight ten-year phases with their gan-zhi pairs and starting ages.
Start with your Day Master element — it is the core symbol of your chart. A Wood Day Master, for example, suggests growth-oriented energy; Fire suggests expressive and warm energy; Earth suggests steady and grounded energy; Metal suggests structured and decisive energy; Water suggests adaptable and communicative energy. These are symbolic tendencies, not fixed traits. Next, look at the five-element balance: which element is strongest, which is weakest, and whether the chart leans toward a "strong" or "weak" Day Master. The Da Yun table gives you a timeline of symbolic phases — ten-year windows that the classical method associates with shifts in emphasis. Use this as a reflective framework, not a verdict.
Celestial Atlas presents BaZi as a structured lens for self-reflection — comparable to how people use Western astrology for personality exploration. We deliberately do not issue outcome predictions, fate verdicts, or fortune-telling readings. The Da Yun table is framed as age-phase context, not a promise about your future. Nothing here replaces medical, financial, or legal advice. We collect only the minimum data needed to draw the chart on this page; no birth data is stored or transmitted.