BaZi (八字) is a map of who you are — your enduring pattern, strengths, and the decade-long luck cycles you move through. Qi Men Dun Jia (奇门遁甲) is the art of timing: it reads the energy of a specific moment to help you decide when to act, wait, or change course.
The most honest reading holds both — your lasting pattern (BaZi) beside the weather of the hour (Qi Men) — so timing advice is grounded in who you actually are, not a generic forecast. That's the whole idea behind reading five systems at once, 无吉凶.