Question 1

Is this a complete Bazi chart?

Accepted Answer

No, and we say so directly: a traditional Bazi chart has 4 pillars (Year, Month, Day, Hour). This product covers 2 - Year and Day - both fully computable from your birthdate alone. The Month Pillar needs precise astronomical solar-term boundaries and the Hour Pillar needs your birth time, neither of which we approximate or fake.

Question 2

Is Bazi actually ancient?

Accepted Answer

Yes - its theoretical foundations trace to the Tang dynasty (Li Xuzhong, c. 761-813 CE), refined into the modern four-pillar form by the Song dynasty scholar Xu Ziping. The sexagenary cycle itself (10 Heavenly Stems x 12 Earthly Branches) has been used in Chinese calendrical records for millennia.

Question 3

How accurate is the calculation?

Accepted Answer

The Year Pillar uses the standard 1984=Jiazi reference point. The Day Pillar uses the astronomical Julian Day Number with a verified formula, cross-checked against a real worked example before being used in this product.

Two of your four pillars, done right.