Lingshu: Chapter 41 — Yin-Yang Corresponding to Sun and Moon
📚 Book Information
- Title: Huangdi's Internal Classic · Lingshu (The Spiritual Pivot)
- Chapter: Yin-Yang Corresponding to Sun and Moon, Chapter 41
Overall Paraphrased Meaning
The Yellow Emperor asked: I have heard that heaven pertains to yang and earth pertains to yin; the sun pertains to yang and the moon pertains to yin. How do the channels and vessels of the human body correspond to the yin-yang of the sun and moon?
Qibo replied: Above the waist corresponds to heaven and pertains to yang; below the waist corresponds to earth and pertains to yin. Therefore, the twelve channels of the feet correspond to the twelve months — the moon arises from water (🌊 yin), so the foot channels located in the lower position pertain to yin; the ten fingers of the hands correspond to the ten Heavenly Stems as days — the sun governs fire (🔥 yang), so the hand channels located in the upper position pertain to yang.
The Yellow Emperor asked further: How exactly do we match the channels with the Heavenly Stems, Earthly Branches, and months?
Qibo elaborated:
The six foot channels correspond to the twelve months (Earthly Branches):
- Yin month (first month) marks the initial arising of yang qi, and governs the left foot Shaoyang channel; Wei month (sixth month) governs the right foot Shaoyang channel.
- Mao month (second month) governs the left foot Taiyang channel; Wu month (fifth month) governs the right foot Taiyang channel.
- Chen month (third month) governs the left foot Yangming channel; Si month (fourth month) governs the right foot Yangming channel. These two yang channels converge in the front, like the sun and moon joining their brilliance, hence the name "Yangming" (the channel of greatest yang qi).
- Shen month (seventh month) marks the beginning of yin qi, and governs the right foot Shaoyin channel; Chou month (twelfth month) governs the left foot Shaoyin channel.
- You month (eighth month) governs the right foot Taiyin channel; Zi month (eleventh month) governs the left foot Taiyin channel.
- Xu month (ninth month) governs the right foot Jueyin channel; Hai month (tenth month) governs the left foot Jueyin channel. These two yin channels are where yin qi is completely exhausted, hence the name "Jueyin" (the channel where yin ends and yang is reborn).
The six hand channels correspond to the ten days (Heavenly Stems):
- Jia day governs the left hand Shaoyang channel, Ji day governs the right hand Shaoyang channel.
- Yi day governs the left hand Taiyang channel, Wu day governs the right hand Taiyang channel.
- Bing day governs the left hand Yangming channel, Ding day governs the right hand Yangming channel. These two yang channels pertain to fire; when two fires combine, they are called "Yangming".
- Geng day governs the right hand Shaoyin channel, Gui day governs the left hand Shaoyin channel.
- Xin day governs the right hand Taiyin channel, Ren day governs the left hand Taiyin channel.
Further summarizing their yin-yang attributes:
- Foot yang channels (below) pertain to the Shaoyang within yin;
- Foot yin channels (below) pertain to the Taiyin within yin;
- Hand yang channels (above) pertain to the Taiyang within yang;
- Hand yin channels (above) pertain to the Shaoyin within yang.
With respect to the five viscera:
- Heart resides above the diaphragm and pertains to yang, being the Taiyang within yang;
- Lung resides above the diaphragm and pertains to yang, yet its nature is to descend and purify, being the Shaoyin within yang;
- Liver resides below the diaphragm and pertains to yin, yet its nature is to ascend and spread, being the Shaoyang within yin;
- Spleen resides below the diaphragm and pertains to yin, dwelling at the center, being the Supreme Yin (Zhiyin) within yin;
- Kidney resides below the diaphragm and pertains to yin, being the Taiyin within yin.
The Yellow Emperor asked: How do these theories guide clinical treatment?
Qibo replied: 💨 Human qi (channel qi) distributes differently between the left and right sides of the body according to the months:
- In months one, two, and three, human qi concentrates on the left, so one should not needle the yang channels of the left foot;
- In months four, five, and six, human qi concentrates on the right, so one should not needle the yang channels of the right foot;
- In months seven, eight, and nine, human qi concentrates on the right, so one should not needle the yin channels of the right foot;
- In months ten, eleven, and twelve, human qi concentrates on the left, so one should not needle the yin channels of the left foot.
The Yellow Emperor raised another question: According to the Five Element correspondence, the east and the stems Jia and Yi pertain to wood, flourishing in spring; spring's color is green; the five viscera correspond to the liver; and the liver channel is the foot Jueyin channel. Yet now you assign "Jia" to the left hand Shaoyang channel — this does not match the Five Element sequence. Why is that?
Qibo explained: This is the principle of correlating with the yin-yang of heaven and earth (the great yin-yang of time and space), which differs from the sequential order of the Four Seasons and Five Elements. Moreover, yin and yang are inherently abstract concepts that have names but no fixed physical form — when extended, they can be counted to ten, divided to a hundred, scattered to a thousand, and pushed to ten thousand, changing endlessly — this is precisely what is being spoken of.
🧠 Deep Understanding
Core Principles 💡
The central academic thought of this chapter lies in the spatiotemporal holographic view that "human beings arise from the qi of heaven and earth, and are formed by the laws of the four seasons":
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Upper-lower yin-yang stratification: With the waist as the boundary, above the waist corresponds to heaven and pertains to yang; below the waist corresponds to earth and pertains to yin. This is the fundamental framework for dividing yin and yang in the human body according to the Neijing, laying the foundation for all subsequent channel correspondences.
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Hand and foot as two categories of yin-yang: The hands are above, corresponding to the sun, to fire 🔥, and to the Heavenly Stems (decimal system); the feet are below, corresponding to the moon, to water 🌊, and to the Earthly Branches (duodecimal system). This reflects the ancient thinking of mapping calendrical cycles onto human bodily rhythms — the ten Heavenly Stems correspond to the ten fingers, and the twelve Earthly Branches correspond to the twelve foot channels, literally "dressing" the astronomical calendar onto the human body.
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The origin of the names "Yangming" and "Jueyin": The original text clarifies that "Yangming" = the joining of two yangs (the peak of yang qi), and "Jueyin" = the exhaustion of two yins (yin nearly spent, yang about to be reborn). This is an important source for the naming system of the channels.
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The theory of "where human qi resides" — channel qi moving through time and space: In the odd months of the first half of the year, human qi resides on the left; in even months, on the right. In the odd months of the second half, human qi resides on the right; in even months, on the left. Acupuncture should avoid the side where human qi resides and its corresponding yin-yang nature. This embodies the therapeutic principle of "treating in accordance with the seasons" and "adapting to the time" — resembling an ancient, naive understanding of human biological rhythms.
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The infinite divisibility of yin-yang: The closing statement of the chapter, "yin and yang have names but no fixed form," reveals that yin-yang is an ever-divisible abstract modeling tool, not a fixed physical entity. This is a profoundly sophisticated "meta-theoretical" discourse within Chinese medical philosophy.
Modern Perspectives 🌟
- The body subdivision of "above the waist as heaven, below the waist as earth" closely corresponds to how anatomical science divides the body cavity into thoracic and abdominal cavities by the diaphragm, reflecting the ancients' simple holistic view and topological thinking.
- The monthly rhythm of "where human qi resides" can be connected to modern chronobiology and biorhythm research: the human body indeed exhibits annual and monthly rhythms (e.g., seasonal fluctuations in endocrine and immune function). While the specific "left/right" correspondences drawn by the ancients from clinical observation lack evidence in modern anatomy and physiology, the general direction that "human functional states change over time in cycles" is consistent with modern scientific understanding.
- The stem-branch-channel-month correspondence system is a constructive theoretical framework containing significant speculative elements. It is better understood as a symbolic system ancients used to explain bodily rhythms rather than as a physical entity that modern scientific instruments can directly verify.
- The assertion that "yin and yang have names but no fixed form" is philosophically far ahead of its time, bearing remarkable similarity to the "black box model" in modern systems theory and cybernetics (describing a system through input-output relationships without directly observing internal entities).
- Limitations: Directly equating astronomical-calendrical cycles to the positions of channel qi and blood in the human body is an analogical inference through "taking images and drawing parallels" (quxiang bilei). The precise correspondences lack empirical validation and should be regarded more as an intellectual backdrop for understanding the principle of "treating according to the season" in modern clinical application, rather than as a mechanically operational manual.
Health Preservation Insights ⚡
- Align with annual rhythms: The ancients believed that channel qi shifts between left/right and upper/lower according to the seasons, suggesting that the body's state emphasizes different aspects in different seasons — e.g., yang qi tends to be more upward in spring/summer and more downward in autumn/winter. Daily wellness practices can follow this: more activity and stretching in spring/summer, more restraint and quiet recuperation in autumn/winter — in sync with natural rhythms.
- Respect the upper-lower boundary: The waist serves as the hub where yin and yang qi ascend and descend. Paying attention to warmth and moderate exercise of the waist area, maintaining smooth communication between upper and lower qi, is generally beneficial for overall health maintenance.
- Insights on yin-yang balance: The statement "yin and yang have names but no fixed form; extendable to ten thousand" reminds us not to be rigid in our understanding of bodily states — cold/heat, deficiency/excess, interior/exterior are all dynamic and changing. Health preservation should also be flexible, avoiding fixation on any single extreme.
- The connection between daily routines and sun/moon: The hands correspond to the sun and the feet correspond to the moon, suggesting the daily rhythm of actively engaging the hands (yang) during the day and quietly nourishing the feet (yin) at night — proper activity in the daytime, rest in the nighttime. The ancient wisdom of "rise with the sun, rest with the sunset" remains worth heeding even today.
📚 Related Knowledge
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Associated Concepts:
- Three Yin and Three Yang: Taiyang, Yangming, Shaoyang, Taiyin, Shaoyin, Jueyin — the core framework of the channel naming system
- Yin-yang zoning of the body: Division into upper and lower yin-yang with the waist as boundary, complementing the "back is yang, abdomen is yin" from Suwen · Chapter 4, Golden Chamber Truth]
- Treating according to time (Yinshi Zhiyi): One of the key principles of TCM therapy, emphasizing the influence of time factors on the human body
- Earthly Branches and the twelve channels: The correspondence system between the twelve Earthly Branches and the twelve main channels
- Heavenly Stems and the Five Elements: The five-element correspondence system of Jia/Yi (wood), Bing/Ding (fire), Wu/Ji (earth), Geng/Xin (metal), Ren/Gui (water)
- Yin-yang attributes of the five viscera: Heart = Taiyang within yang, Lung = Shaoyin within yang, Liver = Shaoyang within yin, Spleen = Supreme Yin within yin, Kidney = Taiyin within yin
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Further Reading:
- Lingshu · Chapter 10, The Channels — the pathways of the twelve channels
- Lingshu · Chapter 11, The Divergent Channels — the distribution patterns of the twelve divergent channels
- Suwen · Chapter 4, Golden Chamber Truth — the specific yin-yang zoning of the body
- Suwen · Chapter 3, Discussion on the Correspondence between Life and Heaven Qi — general discourse on yin-yang and heaven-earth correspondence
- Lingshu · Chapter 40, Yin-Yang and Clear-Turbid — classification of clear and turbid attributes of qi and blood in the body
- Lingshu · Chapter 76, The Movement of Defensive Qi — the day-night circulation rhythm of defensive qi (serving as a cross-reference for the "where human qi resides" theory)
This content is based on classical texts of Traditional Chinese Medicine and is intended solely for cultural study and scholarly reading. It does not constitute any medical diagnosis, medication advice, or treatment recommendation. If you feel unwell, please seek medical attention promptly.
