BaZi, or the Four Pillars of Destiny, interprets birth information through four stem–branch pairs: year, month, day and hour. Each pillar includes a Heavenly Stem and an Earthly Branch, producing the ‘eight characters’ of the Chinese name. The system emphasizes cyclical time, the Five Phases and the relationship of all pillars to the Day Master.
The four pillars
The year pillar relates to a broader social and ancestral setting in many schools; the month pillar connects to season and work environment; the day pillar is particularly important because its Heavenly Stem is the Day Master; and the hour pillar introduces further temporal and life-stage symbolism. Exact time and the chosen calendar conventions affect the result.
Reading the Day Master and Five Phases
A chart’s Day Master belongs to one of five phases with yin or yang polarity. Analysts examine seasonal support, the distribution of visible and hidden stems, relationships among branches, and systems such as the Ten Gods. A dominant element does not automatically make a chart favorable: the configuration and interpretive school determine how strength and balance are judged.
Luck pillars and calendar conventions
Ten-year luck pillars and annual influences are used to study change over time. Li Chun and solar-term calculations can matter for pillar boundaries, while the civil lunar New Year is the familiar popular zodiac reference. Distinguish these approaches to avoid assigning the wrong year or month pillar.
Read the wider Chinese astrology guide
See Chinese Astrology for how animals, elements and birth pillars fit into the wider system.