Bazi computation is exact. A one-hour difference in birth time can change your Hour Pillar entirely, shifting your Operating Archetype and cycle timing. Your birth city matters too; longitude and timezone affect the calculation.
Your chart is built from four pillars: Year, Month, Day, and Hour of birth. Each pillar contains two characters drawn from a cycle of 60 valid combinations, governed by strict classical rules that lock certain characters together based on what came before. Multiplied across all four pillars and two gender directions, the system produces over one million unique chart configurations. Unlike personality tests that sort you into 16 types, or western astrology with 12 signs, your output is not a category you have been sorted into. It is a map specific to you.
If you do not know your exact birth time, select "I don't know" during setup. Your analysis remains valid. Accuracy improves with a confirmed birth time.