Chai-bu: yin and yang dun, the ju, and the solar term
Hour Qi Men builds one board from a civil clock. The year stem sets yin or yang dun. The solar term sets the ju. This site uses chai-bu and does not switch methods in the background.
Editorial review: 2026-09-22 · Reviewed by fateshow · Editorial method
The year stem sets yin or yang dun
Yin or yang dun follows the year stem. It does not follow which way the question hopes to go. Chai-bu prints that choice in the ju name.
The illustration is 10:30 on 11 January 2024, Asia/Shanghai. The engine prints yang ju 5.
The solar term sets the ju
The ju follows the solar term. This clock falls in Slight Cold. The civil month does not replace the term.
The pillars print Gui-Mao, Yi-Chou, Jia-Xu, and Ji-Si. The month still follows the term.
One method only
The same clock and the same method rebuild the same board. Other ju methods stay off this page.
Compare the ju name and the term before comparing doors and stars.
Illustration: yang ju 5 in Slight Cold
11 January 2024, 10:30. Yang ju 5, Slight Cold, xun head Jia-Zi. The day void is Shen and You. The hour void is Xu and Hai. This is an hour board, not a birth chart.
The definition is on What Qi Men is.
Common mistakes
- Setting the ju from the civil month.
- Mixing two ju methods on one page.
- Reading an hour board as a birth chart.
Use it in fateshow
Qi Men Dun Jia
A nine-palace board cast from the moment, read by useful god, palace and direction
Open tool →Frequently asked questions
Which term is yang ju 5 here?
The engine prints Slight Cold. Read the ju name together with the term.
Does the void delete a palace?
No. Shen-You and Xu-Hai are marks. Doors and stars stay.
Can a board be cast without a question?
No. One board belongs to one written question.
Sources and editorial basis
- 1. Yanbo Diaosou Ge, transmitted text
Traditional names for yin and yang dun, the ju, the doors, and the stars.
- 2. fateshow rule snapshot
Supports only the fields the engine printed in the illustration. An illustration is not something that has already happened.