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Why must intercalary (run) ju be set in Qi Men Dun Jia?

Because one solar term lasts about 15 days 2 hours 5 ke, a little more than 15 days. The surplus accumulates over many solar terms and shifts a whole yuan, so an additional intercalary ju must be set to compensate. The book Qi Men Zhi Gui holds that setting the intercalary ju must be based on the actual deviation, and should not be fixed at Mang Zhong and Da Xue.

From the article “How to Determine Yang Dun or Yin Dun, the Ju Number, and Zhi Fu and Zhi Shi in Qi Men Dun Jia”

Traditional systems

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Dictionary › Stems, branches & zodiac animals

What is Con giáp?

The zodiac animal system is the twelve Earthly Branches, from Rat to Pig, used to reckon years, months, hours and ages in East Asian culture.

Updated 11 Sept 2026Traditional systems
Dictionary › Stems, branches & zodiac animals

What is Lục Thập Hoa Giáp?

The Sixty Jiazi is a cycle of 60 sexagenary combinations of Heavenly Stems and Earthly Branches used to number years, months, days and hours.

Updated 12 Sept 2026Calendar and astronomy
Knowledge › Eastern › Zi Wei Dou Shu

What is giáp cung in Tử Vi and how are the stars placed?

Giáp cung in Tử Vi: why Kình Đà always flank Lộc Tồn, when Tả Hữu and Xương Khúc can flank Mệnh, and how Tử Vi Đẩu Số toàn thư ranks each case.

Updated 12 Oct 2026Traditional systems
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