黄帝问曰∶余闻天为阳，地为阴，日为阳，月为阴，大小月三百六十日成一岁，人亦应之。今三阴
三阳，不应阴阳，其故何也？岐伯对曰∶阴阳者，数之可十，推之可百，数之可千，推之可万，万之大不可胜
数，然其要一也。天复地载，万物方生，未出地者，命曰阴处，名曰阴中之阴；则出地者，命曰阴中之
阳。阳予之正，阴为之主。故生因春，长因夏，收因秋，藏因冬，失常则天地四塞。阴阳之变，其在人者，
亦数之可数。帝曰∶愿闻三阴三阳之离合也。岐伯曰∶圣人南面而立，前曰广明，后曰太冲，太冲之地，名
曰少阴，少阴之上，名曰太阳，太阳根起于至阴，结于命门，名曰阴中之阳。中身而上，名曰广明，广明之
下，名曰太阴，太阴之前，名曰阳明，阳
明根起于厉兑，名曰阴中之阳。厥阴之表，名曰少阳，少阳根起于窍阴，名曰阴中之少阳。是故三阳之离合
也，太阳为开，阳明为阖，少阳为枢。三经者，不得相失也，搏而勿浮，命曰一阳。帝曰∶愿闻三阴。岐伯曰∶
外者为阳，内者为阴，然则中为阴，其
冲在下，名曰太阴，太阴根起于隐白，名曰阴中之阴。太阴之后，名曰少阴，少阴根起于涌泉，名曰阴中之
少阴。少阴之前，名曰厥阴，厥阴根起于大敦，阴之绝阳，名曰阴之绝阴。是故三阴之离合也，太阴为开，
厥阴为阖，少阴为枢。三经者，不得相失也，搏而勿沉，名曰一阴。阴阳冲冲，积传为一周，气里形表而为
相成也。
The Yellow Emperor asked: I have heard that Heaven is Yang, Earth is Yin; the Sun is Yang, the Moon is Yin. The combination of large and small months totals three hundred and sixty days to form one year, and the human body corresponds to this. Now, the Three Yin and Three Yang meridians do not seem to correspond with Yin and Yang in number. What is the reason for this?
Qibo replied: Yin and Yang, when counted, can extend to ten; when deduced, to a hundred; when counted further, to a thousand; when deduced further, to ten thousand. The magnitude of ten thousand is incalculable, yet its essence remains singular. Heaven covers above, Earth supports below, and all things are born. Those not yet emerging from the earth are said to be in a Yin position, named Yin within Yin; those that have emerged from the earth are said to be in Yin, named Yang within Yin. Yang provides the correct form, while Yin serves as the master of growth. Thus, life arises due to Spring, grows due to Summer, harvests due to Autumn, and stores due to Winter. If these patterns are violated, the Qi of Heaven, Earth, and the Four Seasons will become blocked. The changes of Yin and Yang, as manifested in humans, are also calculable by numbers.
The Emperor said: I wish to hear about the separation and union (Li He) of the Three Yin and Three Yang.
Qibo said: When a sage stands facing South, the front is called Guangming (Broad Brightness), and the back is called Taichong (Great Surge). In the region of Taichong, it is named Shaoyin (Foot-Shaoyin Kidney Meridian). Above Shaoyin is named Taiyang (Foot-Taiyang Bladder Meridian). The Taiyang meridian originates at Zhiyin (BL67) and terminates at Mingmen (Gate of Life, referring to the eyes), and is named Yang within Yin. In the upper part of the body, it is called Guangming. Below Guangming is named Taiyin (Foot-Taiyin Spleen Meridian). Before Taiyin is named Yangming (Foot-Yangming Stomach Meridian). The Yangming meridian originates at Lidui (ST45) and is named Yang within Yin. On the exterior of Jueyin (Foot-Jueyin Liver Meridian) is named Shaoyang (Foot-Shaoyang Gallbladder Meridian). The Shaoyang meridian originates at Qiaoyin (GB44) and is named Lesser Yang within Yin. Therefore, in the separation and union of the Three Yang meridians, Taiyang acts as the Opening, Yangming as the Closing, and Shaoyang as the Pivot. These three meridians must not deviate from each other; their pulse should be firm but not floating, which is called One Yang.
The Emperor said: I wish to hear about the Three Yin.
Qibo said: The exterior is Yang, the interior is Yin. Thus, the middle is Yin, and its Chong (Surging) vessel is located below, named Taiyin (Foot-Taiyin Spleen Meridian). The Taiyin meridian originates at Yinbai (SP1) and is named Yin within Yin. Behind Taiyin is named Shaoyin (Foot-Shaoyin Kidney Meridian). The Shaoyin meridian originates at Yongquan (KI1) and is named Lesser Yin within Yin. Before Shaoyin is named Jueyin (Foot-Jueyin Liver Meridian). The Jueyin meridian originates at Dadun (LR1). This is the absolute Yang of Yin, named the Absolute Yin of Yin. Therefore, in the separation and union of the Three Yin meridians, Taiyin acts as the Opening, Jueyin as the Closing, and Shaoyin as the Pivot. These three meridians must not deviate from each other; their pulse should be firm but not sunken, which is called One Yin. The Qi of Yin and Yang flows vigorously, accumulating and transmitting in a complete cycle. Qi resides internally, while Form manifests externally, thereby mutually completing each other.