Most casual readers of the Chinese zodiac know their year sign. Far fewer know that the year sign is only one of four pillars in a complete Chinese astrological chart. The full system, called Bazi (八字), or 'eight characters,' assigns each person a sign and an element for the year, month, day, and hour of their birth. The result is eight characters total — four animal signs and four elements — that together describe a much richer personality and life-arc than the year sign alone can suggest.
The year pillar describes your relationship to ancestry, society, and the public-facing version of yourself — what people see when they meet you for the first time. The month pillar describes your relationship to family, work, and the projects you devote yourself to during the productive middle of life. The day pillar — sometimes called the 'self pillar' — describes your innermost identity and your closest relationships, especially partnership. The hour pillar describes your aspirations, hidden talents, and the legacy you leave behind in old age.
A full Bazi reading is well beyond the scope of a single article, but the simple act of finding all four of your pillars — using a Bazi calculator with your exact birth date and time — is often a revelation. People who have always felt that their year sign 'doesn't quite fit them' often discover that their day pillar tells a much more accurate story. Bazi is, in a sense, the difference between knowing your sun sign in Western astrology and knowing your full natal chart. Both are valid; one is far richer.