第二讲 超神接气和置闰

Lecture 2: Transcending the Spirit, Connecting the Qi, and Intercalary Adjustment

Overall Paraphrase

The previous lecture explained that the specific numbers of the Yin and Yang Dun patterns are determined by the solar terms. However, in actual practice, determining the pattern is not a mechanical adherence to the solar terms; it also depends on the Heavenly Stems and Earthly Branches of the day.

First, look at the Heavenly Stem of the day. Each five-day period constitutes one pattern (ju), and the first day of each pattern must have a Stem of Jia or Ji. Jia is the first of the Ten Heavenly Stems. The pattern begins with Jia; Jia, Yi, Bing, Ding, Wu together make five days, forming one pattern. The next pattern begins with Ji; Geng, Xin, Ren, Gui make another five days. Then the following five-day period begins again with Jia. This cycle repeats continuously.

Next, examine the Earthly Branch of the day. The Earthly Branches for the first days of the Upper, Middle, and Lower Yuan of each solar term also follow a pattern. Before explaining this pattern, we must first discuss the Meng, Zhong, and Ji categories of the Twelve Earthly Branches. There are twelve Earthly Branches and twelve months in a year, so each Earthly Branch is paired with one month, known as "month establishment" (yue jian). The first month is established by Yin, the second by Mao, the third by Chen, the fourth by Si, the fifth by Wu, the sixth by Wei, the seventh by Shen, the eighth by You, the ninth by Xu, the tenth by Hai, the eleventh by Zi, and the twelfth by Chou. If we divide according to the four seasons, each season contains three months: Yin, Mao, and Chen form Spring; Si, Wu, and Wei form Summer; Shen, You, and Xu form Autumn; and Hai, Zi, and Chou form Winter. Within each season's three months, the first is called "Meng," the second "Zhong," and the third "Ji." Therefore, Yin, Shen, Si, and Hai are the "Four Meng"; Zi, Wu, Mao, and You are the "Four Zhong"; and Chen, Xu, Chou, and Wei are the "Four Ji."

In Qi Men arrangement, for each solar term's Upper, Middle, and Lower Yuan, the Earthly Branch of the first day follows this rule: regardless of the solar term, the first day of the Upper Yuan must have an Earthly Branch among the Four Zhong — limited to Zi, Wu, Mao, or You; the first day of the Middle Yuan must have an Earthly Branch among the Four Meng — limited to Yin, Shen, Si, or Hai; the first day of the Lower Yuan must have an Earthly Branch among the Four Ji — limited to Chen, Xu, Chou, or Wei.

Combining the rules for Heavenly Stems and Earthly Branches, the Stems and Branches for the first day of each Yuan (Upper, Middle, Lower) in every solar term are shown in the table below:

Therefore, to determine which pattern (ju) a given day belongs to, first check which solar term the day falls in. On a broad scale, the twelve solar terms from the Winter Solstice to Grain in Ear are Yang Dun, while the twelve solar terms from the Summer Solstice to Major Snow are Yin Dun. On a finer scale, once Yin Dun or Yang Dun is determined, look at which Yuan of which solar term the day belongs to, and this determines the corresponding pattern.

The Upper Yuan of a solar term does not necessarily begin on the day the solar term arrives. The first day of the Upper Yuan sometimes comes before the solar term, sometimes after, and only occasionally coincides with the solar term itself. The first day of a solar term's Upper Yuan is called the "Fu Tou" (Symbol Head). When the Fu Tou arrives before the solar term, this is called "Chao Shen" (Transcending the Spirit). When the Fu Tou has not yet arrived but the solar term has already come, this is called "Jie Qi" (Connecting the Qi). When the Fu Tou and the solar term fall on exactly the same day, this is called "Zheng Shou" (Direct Bestowal).

When "Transcending the Spirit" first begins, the Fu Tou is only one or two days ahead of the solar term, and over time it gradually moves further ahead. When it exceeds the solar term by nine days, an "Intercalary Adjustment" (zhi run) becomes necessary. Intercalary adjustment means repeating a solar term — that is, re-running the Upper, Middle, and Lower Yuan sequences of that specific solar term. For example, if intercalary adjustment is performed at Grain in Ear: the Upper, Middle, and Lower Yuan of Grain in Ear correspond to Yang Dun patterns six, three, and nine respectively. After the Grain in Ear Lower Yuan Yang Dun pattern nine concludes, following the last day (the fifth day of the Grain in Ear Lower Yuan), one does not transition down to the Summer Solstice. Instead, continuing in sequence according to the day order, yang Dun patterns six, three, and nine are run once again, and only then does the Summer Solstice Upper Yuan Yin Dun pattern nine begin. The three Yuan repeated through intercalary adjustment are called "Run Qi" (Intercalary Anomaly).

It must be noted that not every solar term can undergo intercalary adjustment. Only the Grain in Ear (Mang Zhong) and Major Snow (Da Xue) solar terms permit intercalary adjustment. If the excess is not at Grain in Ear or Major Snow, even if the Fu Tou is more than ten days ahead, intercalary adjustment may not be performed. These two solar terms are chosen because they fall precisely before the Winter Solstice and the Summer Solstice. Yang Dun begins at the Winter Solstice, and Yin Dun begins at the Summer Solstice. By performing intercalary adjustment at the solar term preceding these two pivotal points, the Fu Tou can be recalibrated before Yang Dun or Yin Dun begins, bringing the Fu Tou as close as possible to the solar term and avoiding excessive advancement.

🧠 Deep Understanding

Core Concepts 💡

• The relationship between the Fu Tou and solar terms is key to determining the pattern: Qi Men Dun Jia does not simply switch patterns by the solar term date, but uses the "Fu Tou" (the Jia/Ji day marking the first day of each Yuan) as the marker, combined with the solar terms, to determine Chao Shen, Jie Qi, or Zheng Shou.
• The Heavenly Stem cycle and Earthly Branch cycle overlap: Jia and Ji provide the five-day per pattern cycle for Heavenly Stems; Earthly Branches are categorized into Meng, Zhong, and Ji corresponding to Upper, Middle, and Lower Yuan, forming fixed combinations within the sexagenary cycle.
• Intercalary adjustment is a calendrical calibration mechanism: When the Fu Tou runs too far ahead, repeating one solar term "resets" the relationship between the Fu Tou and the solar term, preserving the harmonic rhythm of the Yin Dun and Yang Dun starting points (Winter Solstice and Summer Solstice).

Modern Interpretation 🌟

• The essence of calendrical coordination: Chao Shen, Jie Qi, and intercalary adjustment are analogous to leap months in the lunar calendar — they are correction mechanisms designed by ancient calendrical astronomers to resolve the incomplete synchronization between solar terms (the solar return cycle) and the sexagenary day-counting system (the sixty-day cycle). This is not a mystical operation but a calibration rule for time sequences ⏳.
• Systematic thinking: Treat the Heavenly Stems, Earthly Branches, and solar terms as three periodic systems and align them through the interface of the "Fu Tou." Modern project management's "milestone alignment" and database "clock synchronization" follow similar logic.
• Demystified understanding: Intercalary adjustment does not change fortune or misfortune; it simply ensures that pattern arrangements do not drift on the time axis. Understanding this prevents mystifying "Chao Shen" and "Jie Qi."

Practical Value ⚡

• Steps for determining the pattern for a given day:
  1. Confirm the solar term of the day in question (from Winter Solstice to Grain in Ear is Yang Dun; from Summer Solstice to Major Snow is Yin Dun).
  2. Find the nearest Jia or Ji day within that solar term and determine whether it falls in the Upper, Middle, or Lower Yuan.
  3. Match the Yuan level to the specific pattern of that solar term (e.g., the Upper Yuan of a Yang Dun solar term corresponds to a specific pattern).
  4. If the day falls during Grain in Ear or Major Snow and the Fu Tou exceeds nine days ahead, the pattern must be arranged according to the intercalary-adjusted sequence.
• Quick Fu Tou identification technique: Remembering that the Upper Yuan Fu Tou only falls on Jia-Zi, Jia-Wu, Ji-Mao, or Ji-You; the Middle Yuan only on Jia-Shen, Jia-Yin, Ji-Si, or Ji-Hai; and the Lower Yuan only on Jia-Xu, Jia-Chen, Ji-Chou, or Ji-Wei, enables rapid chart setting.
• Avoiding pattern-determination errors: On the day a solar term begins, first check whether the Fu Tou precedes or follows the solar term to determine whether it is Chao Shen or Jie Qi; do not switch patterns simply based on the solar term name.

Philosophical Reflection 🤔

• The rhythmic harmonization of heaven and human affairs: The Fu Tou running ahead or behind is like the rhythm gap between the ideal and reality. The ancient Chinese did not force an inflexible fit but used the flexible mechanism of "intercalary adjustment" to let the system return to balance through dynamic adjustment.
• The pivotal position of the Two Extremes of Yin and Yang: The Winter Solstice marks the birth of yang, and the Summer Solstice marks the birth of yin — these are the gateways of yin-yang transformation. Choosing Grain in Ear and Major Snow for intercalary adjustment embodies the wisdom of "hitching to the pivot of yin and yang" ☯️.
• The doctrine of the mean and adaptation: Zheng Shou represents the ideal state, while Chao Shen and Jie Qi are the norm. Intercalary adjustment is a technique of "adaptation" — rather than rigidly adhering to a fixed starting method, it adjusts according to circumstances to maintain overall harmony.

📚 Related Knowledge

Related Concepts

• Fu Tou (Symbol Head): The Jia or Ji day that begins each Yuan and serves as the benchmark for pattern determination.
• Three Yuan: Each solar term is divided into Upper, Middle, and Lower Yuan, each lasting five days.
• Meng, Zhong, Ji: The Four Meng (Yin, Shen, Si, Hai), Four Zhong (Zi, Wu, Mao, You), and Four Ji (Chen, Xu, Chou, Wei), used to distinguish the Earthly Branches among the Three Yuan.
• Yin Dun and Yang Dun: From Winter Solstice to Grain in Ear is Yang Dun; from Summer Solstice to Major Snow is Yin Dun.
• Intercalary Adjustment and Run Qi: Repeating the Three Yuan of one solar term at Grain in Ear or Major Snow; the repeated Three Yuan are called Run Qi.

Further Reading

• Chapter 1 of the Qi Men Dun Jia Tutorial: Determining Yang and Yin Dun patterns by solar terms.
• "Yan Bo Diao Sou Ge" (Song of the Old Fisherman by the Misty Waves): Verses describing the relationship between Qi Men Dun Jia chart arrangement and solar terms.
• "Xie Ji Bian Fang Shu" (Book of Auspicious Selection): Ancient calendrical literature concerning calendars, Heavenly Stems and Earthly Branches, and intercalary adjustment.
• "Qin Ding Gu Jin Tu Shu Ji Cheng — Li Xiang Hui Bian" (Complete Collection of Ancient and Modern Books — Astronomy Section): Content on sexagenary day counting and solar term calibration.

Modern Research

• Historical studies of astronomical calendars: Issues of intercalation, super-calculation, and Qi-coupling in ancient calendars can be compared with Qi Men intercalary adjustment.
• Time series analysis: The misalignment and correction between the sexagenary cycle and the solar term cycle can be modeled with periodic functions and phase adjustment.
• Scientific discussions of traditional numerology: Some scholars reinterpret Qi Men's Chao Shen and Jie Qi from the perspective of calendrical mathematics, stripping away mystical overtones.