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(This is an explanation of the diagram regarding the hundred divisions of day and night and the twelve double-hour fixed-body system.)

The Hand-Taiyin Lung Meridian (Hand-Taiyin Fei Jing) pairs with the Hand-Yangming Large Intestine Meridian (Hand-Yangming Dachang Jing), forming a exterior-interior relationship. The hand is designated as the upper section. The Hand-Taiyin Lung Meridian has five acupoints, which are Yin points. Starting from the lateral side of the radial finger (index finger) at the corner of the nail, the points are Shangyang (LI1), Erjian (LI2), Sanjian (LI3), Hegu (LI4), Yangxi (LI5), and Quchi (LI11). The Large Intestine belongs to Metal. In the Earthly Branches, it corresponds to Mao (Rabbit); in the Heavenly Stems, it corresponds to Geng. This is referred to as the pairing of Yin-Yang exterior-interior and Earthly Branches-Heavenly Stems.

The Hand-Jueyin Pericardium Meridian (Hand-Juexin Baojing) pairs with the Hand-Shaoyang Triple Energizer Meridian (Hand-Shaoyang Sanjiao Jing), forming a exterior-interior relationship. The hand is designated as the middle section. The Hand-Jueyin Pericardium Meridian has five acupoints, which are Yin points. The Hand-Shaoyang Triple Energizer Meridian has six acupoints, which are Yang points. Starting from the tip of the little finger, away from the corner of the nail, the points are Guanchong (TE1), Yemen (TE2), Zhongzhu (TE3), Yangchi (TE4), Zhigou (TE6), and Tianjing (TE10). The Triple Energizer belongs to Fire. In the Earthly Branches, it corresponds to Yin (Tiger); in the Heavenly Stems, it corresponds to Jia. This is referred to as the pairing of Yin-Yang exterior-interior and Earthly Branches-Heavenly Stems.

The Hand-Shaoyin Heart Meridian (Hand-Shaoyin Xin Jing) pairs with the Hand-Taiyang Small Intestine Meridian (Hand-Taiyang Xiaochang Jing), forming a exterior-interior relationship. The hand is designated as the lower section. The Hand-Shaoyin Heart Meridian has five acupoints, which are Yin points. Starting from the medial side of the little finger, the points are Shaochong (HT9), Shaofu (HT8), Shenmen (HT7), Lingdao (HT4), and Shaohai (HT3). The Heart belongs to Fire. In the Earthly Branches, it corresponds to Wu (Horse); in the Heavenly Stems, it corresponds to Ding. The Hand-Taiyang Small Intestine Meridian has six acupoints, which are Yang points. Starting from the tip of the little finger, away from the division of the nail, the points are Shaoze (SI1), QianGu (SI2), Houxi (SI3), Wanggu (SI4), Yanggu (SI5), and Xiaohai (SI8). The Small Intestine belongs to Fire. In the Earthly Branches, it corresponds to Chen (Dragon); in the Heavenly Stems, it corresponds to Bing. This is referred to as the pairing of Yin-Yang exterior-interior and Earthly Branches-Heavenly Stems.

The Foot-Jueyin Liver Meridian (Foot-Jueyin Gan Jing) pairs with the Foot-Shaoyang Gallbladder Meridian (Foot-Shaoyang Dan Jing), forming a exterior-interior relationship. The Foot-Jueyin Liver Meridian ascends to eight cun above the medial malleolus, crossing behind the Foot-Taiyin Spleen Meridian; this is called "crossing meridian." The Foot-Jueyin Liver Meridian has five acupoints, which are Yin points. Starting from the tip of the big toe at Dadun (LR1), the points are Xingjian (LR2), Taichong (LR3), Zhongfeng (LR4), and Ququan (LR8). The Liver belongs to Wood. In the Earthly Branches, it corresponds to Hai (Pig); in the Heavenly Stems, it corresponds to Yi. The Foot-Shaoyang Gallbladder Meridian has six acupoints, which are Yang points. Starting from the tip of the second toe, the points are Qiuyin (GB44), Xiaxi (GB43), Linqi (GB41), Qiuxu (GB40), Yangfu (GB38), and Yanglingquan (GB34). The Gallbladder belongs to Wood. In the Earthly Branches, it corresponds to Shen (Monkey); in the Heavenly Stems, it corresponds to Jia. This is referred to as the pairing of Yin-Yang exterior-interior and Earthly Branches-Heavenly Stems.

The Foot-Taiyin Spleen Meridian (Foot-Taiyin Pi Jing) pairs with the Foot-Yangming Stomach Meridian (Foot-Yangming Wei Jing), forming a exterior-interior relationship. The Foot-Taiyin Spleen Meridian crosses before the Foot-Jueyin Liver Meridian. The Foot-Taiyin Spleen Meridian has five acupoints, which are Yin points. Starting from the medial end of the big toe, the points are Yinbai (SP1), Dabu (SP2), Taibai (SP3), Shangqiu (SP5), and Yinlingquan (SP9). The Spleen belongs to Earth. In the Earthly Branches, it corresponds to Chou (Ox); in the Heavenly Stems, it corresponds to Ji. The Foot-Yangming Stomach Meridian has six acupoints, which are Yang points. Starting from the tip of the second toe, the points are Lidui (ST45), Neiting (ST44), Xangu (ST43), Chongyang (ST42), JieXi (ST41), and Zusanli (ST36). The Stomach belongs to Earth. In the Earthly Branches, it corresponds to You (Rooster); in the Heavenly Stems, it corresponds to Wu. This is referred to as the pairing of Yin-Yang exterior-interior and Earthly Branches-Heavenly Stems.

The Foot-Shaoyin Kidney Meridian (Foot-Shaoyin Shen Jing) pairs with the Foot-Taiyang Bladder Meridian (Foot-Taiyang Pangguang Jing), forming a exterior-interior relationship. The Foot-Shaoyin Kidney Meridian has five acupoints, which are Yin points. Starting from the depression in the sole of the foot, the points are Yongquan (KI1), Rangu (KI2), Taixi (KI3), Fuliu (KI7), and Yinggu (KI10). The Kidney belongs to Water. In the Earthly Branches, it corresponds to Zi (Rat); in the Heavenly Stems, it corresponds to Gui. The Foot-Taiyang Bladder Meridian has six acupoints, which are Yang points. Starting from the lateral side of the little toe, the points are Zhiyin (BL67), Tonggu (BL65), Shugu (BL64), Jinggu (BL64), Kunlun (BL60), and Weizhong (BL40). The Bladder belongs to Water. In the Earthly Branches, it corresponds to Xu (Dog); in the Heavenly Stems, it corresponds to Ren. This is referred to as the pairing of Yin-Yang exterior-interior and Earthly Branches-Heavenly Stems.

These are the twelve meridians of the three Yin and three Yang of the hands and feet, comprising sixty-six acupoints, including the Jing-River-Well-Source-He-Sea points (Five Shu Points), paired with the Five Elements: Metal, Wood, Water, Fire, and Earth. The flow and distribution of meridians involve either crossing or direct paths, relating to exterior-interior and internal-external relationships, as well as the pairing of Earthly Branches and Heavenly Stems. Various schools of acupuncture classics and diagrams have analyzed and explained these concepts. Therefore, I have summarized the general principles here and consulted them with my teacher, verifying what was beyond my capability. For aspects where my understanding differed, I received further instruction and guidance, resulting in a sudden clarity, like ice melting or water bursting forth. With knowledge now in my heart, I am fortunate not to be self-contradictory. Whenever needling acupoints, one must rely on specific meridians, investigate the associated diseases and syndromes, observe daily and hourly taboos, and determine tonification and sedation based on deficiency and excess conditions. These matters must be carefully examined. If one thoroughly understands the differentiation of meridians and the locations of acupoints, such practice will rarely fail (one out of a hundred times).