Qimen in plain English: a tactical calendar, not a horoscope.

If bazi is your chart, qimen is the week. Qi Men Dun Jia (奇門遁甲) is a Chinese forecasting system that's distinct from bazi and worth understanding on its own terms. The short version: bazi is identity, qimen is timing.

Qimen has a long backstory — sources tie it to military strategists in pre-imperial China, where it was used to time troop movements, choose directions for attack or retreat, and read what an envoy from the other side was likely going to say. By the Tang and Song dynasties it had been formalized into the system practitioners use today: a calendar of plates (局) that change throughout the day, each plate carrying information about which directions and decisions are favored at that hour.

The plate

A qimen plate is a 3×3 grid — nine cells, called palaces (宮) — laid out compass-style: south on top, north on bottom, east on the left, west on the right. The center is the ninth palace.

Into this grid the system distributes several layers of symbols:

• The eight doors (八門) — a set of named gateways, each tied to a kind of action.
• The nine stars (九星) — the energetic backdrop of the time.
• The eight gods (八神) — symbolic agents that color the reading.
• The three strange and six instruments (三奇六儀) — the heavenly stems distributed into the grid.

A practitioner reads how these layers stack in a particular palace and uses that to answer a question, choose a direction, or time an action. There are roughly 1,080 distinct plates that cycle through a year.

The eight doors

The doors are the most useful layer to introduce first because they map cleanly to human actions. Each door is associated with one kind of thing:

A door isn't "good" or "bad" in the abstract. It's a fit for a type of action. If the Open Door is sitting in your east palace at the hour you want to send an important request, that's a fit. If the Death Door is sitting in your south palace and you want to ship a launch announcement south, that's a mis-fit and a practitioner would tell you to wait.

Why qimen isn't a horoscope

A horoscope reads the same week for everyone in a sign. A qimen reading is keyed to your question — your decision, your action, your direction. Two readers asking different questions of the same hour get different answers from the same plate.

In practice, qimen tends to answer questions of the form:

• When should I do this thing I'm about to do?
• Which direction should I face / travel / send?
• What's the texture of this week or this day — is it for shipping or for editing?

It doesn't tend to answer:

• What's my personality?
• When will I find love?
• Am I a good or bad person?

Those are bazi questions, or therapy questions, or neither. Mixing the systems is what turns a reading into pseudo-horoscope copy. The practitioners we draw from keep the lines clear.

How Taiyi uses qimen in the weekly letter

We don't try to teach qimen in a Sunday letter. Each letter draws on the current week's plate to color the forecasting sections — when to act, when to wait, what to watch for — but the language stays in plain English, with Chinese terms glossed when they appear. The grounding is in classical sources; the writing is for an English-reading adult who wants to make a decision this week.

In Qi Men terms, good forecasting starts with three parts: who is asking, what is happening now, and what outcome actually matters.

Qimen, used well, is a discipline of asking better questions. The plate gives a structure; the practitioner brings the judgment; the reader brings the action. The letter is the bridge between the three.