What is BaZi (Four Pillars of Destiny)?

BaZi (八字), the Four Pillars of Destiny (四柱命理), is the central system of Chinese natal astrology. "BaZi" means "eight characters" — the eight that encode your birth across four pillars (Year, Month, Day, Hour), each one Heavenly Stem (天干) and one Earthly Branch (地支). As Zi Ping Zhen Quan opens: the method takes the Stems and Branches of one's birth year, month, day and hour to deduce fortune. The logic: the Five Element combination present at birth projects onto a life through the cycles of generation and restraint.

What are the Ten Stems and Twelve Branches?

The Ten Heavenly Stems — Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui — pair with the Five Elements (Wood, Fire, Earth, Metal, Water), each in yang/yin form. The Twelve Earthly Branches — Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai — map to the zodiac animals and each contain one to three "hidden Stems" (藏干), the chart's covert energy. Branches also interact through Three Harmonies (三合), Six Harmonies (六合), and Six Clashes (六冲) — crucial in luck and transit analysis.

How is a BaZi chart calculated?

Four steps: (1) convert the Gregorian date to the Chinese calendar; (2) the Year Pillar — note the astrological year begins at Li Chun (立春), not Lunar New Year; (3) the Month Pillar, bounded by solar terms (节气); (4) the Day and Hour pillars. Critically, BaZi uses True Solar Time (真太阳时), not clock time — each degree of longitude shifts it four minutes, and ignoring this is the most common charting error. The deeporacle.ai calculator computes deterministically against solar-term boundaries and applies the true-solar-time correction from the birthplace longitude automatically.

What is the Day Master, and why is it central?

The Day Master (日主) is the Heavenly Stem of the Day pillar — the chart's reference point. Every other character is read by its Five Element relation to it: same-as-me = Peers (比劫), produced = Output (食伤), controlled = Wealth (财), controlling = Authority (官杀), producing = Resource (印). These ten relations are the Ten Gods (十神), each mapping to a life domain. Without fixing the Day Master, a chart cannot be interpreted.

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BaZi Fundamentals

The core concepts of Four Pillars astrology, from the ground up.

What is BaZi (Four Pillars of Destiny)?: BaZi (八字), the Four Pillars of Destiny (四柱命理), is the central system of Chinese natal astrology. "BaZi" means "eight characters" — the eight that encode your birth across four pillars (Year, Month, Day, Hour), each one Heavenly Stem (天干) and one Earthly Branch (地支). As Zi Ping Zhen Quan opens: the method takes the Stems and Branches of one's birth year, month, day and hour to deduce fortune. The logic: the Five Element combination present at birth projects onto a life through the cycles of generation and restraint.
What are the Ten Stems and Twelve Branches?: The Ten Heavenly Stems — Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui — pair with the Five Elements (Wood, Fire, Earth, Metal, Water), each in yang/yin form. The Twelve Earthly Branches — Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai — map to the zodiac animals and each contain one to three "hidden Stems" (藏干), the chart's covert energy. Branches also interact through Three Harmonies (三合), Six Harmonies (六合), and Six Clashes (六冲) — crucial in luck and transit analysis.
How is a BaZi chart calculated?: Four steps: (1) convert the Gregorian date to the Chinese calendar; (2) the Year Pillar — note the astrological year begins at Li Chun (立春), not Lunar New Year; (3) the Month Pillar, bounded by solar terms (节气); (4) the Day and Hour pillars. Critically, BaZi uses True Solar Time (真太阳时), not clock time — each degree of longitude shifts it four minutes, and ignoring this is the most common charting error. The deeporacle.ai calculator computes deterministically against solar-term boundaries and applies the true-solar-time correction from the birthplace longitude automatically.
What is the Day Master, and why is it central?: The Day Master (日主) is the Heavenly Stem of the Day pillar — the chart's reference point. Every other character is read by its Five Element relation to it: same-as-me = Peers (比劫), produced = Output (食伤), controlled = Wealth (财), controlling = Authority (官杀), producing = Resource (印). These ten relations are the Ten Gods (十神), each mapping to a life domain. Without fixing the Day Master, a chart cannot be interpreted.

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