岁有十二月。日有十二辰。子午为经。卯酉为纬。(天象定者为经动者为纬。子午当南
北二
极。居其所而不移。故为经。卯酉常东升西降。列宿周旋无已。故为纬。)天周二十八宿而
一面七星。四七二十八星。(东方角亢氏房心尾箕。北方斗牛女虚危室壁西方奎娄胃昴毕觜
参。南方井鬼。柳星张翼疹是为四七二十八星)房昴为纬。(房在卯昴在酉。)虚张为经。(虚
在子。张在午。)是故房至毕为阳。(其位在卯辰巳午未申。)昴至心为阴。(其位在酉戌亥
子
丑寅)阳主昼阴主夜。故卫气之行。一日一夜五十周于身。昼日行于阳二十五周。(自足太阳
经至手阳明经。详见下文。)夜行于阴二十五周。周于五岁(按经言自足少阴经而行手少阴经
。手太阴经。足厥阴经。足太阴经。此独遣手厥阴经。当于他篇参详。○岁当作脏。谓天之
阳主昼。人之阳主腑故卫气昼则行于阳分二十五周。天之阴主夜。人之阴主脏。故夜则周于
五脏。)是故平旦阴尽。阳气出于目。(睛明穴。)目张则气上行于头。循项下足太阳循背下
至小指之端。(至阴穴)其散者别于目锐 。下手太阳。下至手小指之间外侧。(少泽穴)其散
者别于目锐 。(瞳子 。)下足少阳。注小指次指之间。(窍阴穴。)以上循手少阳之分侧。
下至小指(次指)之间。(关冲穴)别者以上至耳前。合于颔脉。(承泣颊车之分。)注足阳明以
下行至跗上。入次指之间。(厉兑穴。)其散者从耳下。下手阳明入大指(次指)之间。入掌中
。其至于足也。入足心。出内踝下行阴分复合于目。故为一周。
一年有十二个月，一天有十二个时辰。子午线作为经线，卯酉线作为纬线。（天象中固定不动的称为经，运动的称为纬。子午对应南北两极，处于固定位置而不移动，所以称为经。卯酉常伴随东升西落，群星旋转不息，所以称为纬。）天体环绕二十八宿，每一面七星，四方共二十八星。（东方为角、亢、氏、房、心、尾、箕；北方为斗、牛、女、虚、危、室、壁；西方为奎、娄、胃、昴、毕、觜、参；南方为井、鬼、柳、星、张、翼、轸，这合起来就是四七二十八星。）房宿和昴宿构成纬线。（房宿位于卯位，昴宿位于酉位。）虚宿和张宿构成经线。（虚宿位于子位，张宿位于午位。）因此，从房宿到毕宿这一段属于阳。（其方位在卯、辰、巳、午、未、申。）从昴宿到心宿这一段属于阴。（其方位在酉、戌、亥、子、丑、寅。）阳主管白天，阴主管黑夜。所以卫气（运行于脉外、具有防御作用的气）的运行，一昼夜在全身循环五十周。白天行于阳分二十五周。（自足太阳膀胱经至手阳明大肠经，详见下文。）夜晚行于阴分二十五周。循环于五脏（按经文说法是从足少阴肾经行至手少阴心经、手太阴肺经、足厥阴肝经、足太阴脾经，唯独遗漏了手厥阴心包经，应当参考其他篇章来理解。○“岁”字应作“脏”解，意指天的阳主管白天，人的阳主管腑，所以卫气白天行于阳分二十五周；天的阴主管黑夜，人的阴主管脏，所以夜晚循环于五脏。）因此，清晨时阴气耗尽，阳气出于眼睛。（睛明穴。）眼睛睁开，气便上行至头部，沿着颈部下行至足太阳膀胱经，沿着背部下行至小趾末端。（至阴穴。）其中散行的分支，从目外眦分出，下行至手太阳小肠经，下行至手小指外侧端。（少泽穴。）另一散行分支，从目外眦分出。（瞳子髎穴。）下行至足少阳胆经，注入无名指与小指之间。（窍阴穴。）以上沿着手少阳三焦经的一侧，下行至小指（次指）之间。（关冲穴。）另一分支上行至耳前，与颌部脉络相合。（承泣穴、颊车穴的区域。）注入足阳明胃经，下行至足背，进入第二趾之间。（厉兑穴。）其中散行的分支从耳下分出，下行至手阳明大肠经，进入大指（次指）之间，进入手掌中。当它到达足部时，进入足心，出于内踝，下行至阴分，最后又汇聚于眼睛，这就完成了一周的循环。
There are twelve months in a year and twelve double-hours (Shichen) in a day. The Zi-Wu meridian serves as the longitude (Jing), and the Mao-You meridian serves as the latitude (Wei). (In celestial phenomena, those that remain fixed are termed Jing [longitude/meridian], while those in motion are termed Wei [latitude/parallel]. Zi and Wu correspond to the North and South Poles, residing in their positions without moving, thus designated as Jing. Mao and You constantly rise in the east and set in the west, with constellations revolving endlessly, thus designated as Wei.) The heavens encompass twenty-eight mansions (Xiu), with seven stars per quadrant, totaling twenty-eight stars. (The Eastern quadrant comprises Jiao, Kang, Di, Fang, Xin, Wei, Ji; the Northern quadrant comprises Dou, Niu, Nu, Xu, Wei, Shi, Bi; the Western quadrant comprises Kui, Lou, Wei, Mao, Bi, Zi, Shen; the Southern quadrant comprises Jing, Gui, Liu, Xing, Zhang, Yi, Zhen—collectively forming four sets of seven, i.e., twenty-eight stars.) Fang and Mao constitute the latitude. (Fang is located at Mao; Mao is located at You.) Xu and Zhang constitute the longitude. (Xu is located at Zi; Zhang is located at Wu.) Therefore, the segment from Fang to Bi belongs to Yang. (Its position spans Mao, Chen, Si, Wu, Wei, Shen.) The segment from Mao to Xin belongs to Yin. (Its position spans You, Xu, Hai, Zi, Chou, Yin.) Yang governs the daytime, and Yin governs the nighttime. Consequently, the circulation of Weiqi (Defensive Qi) completes fifty cycles throughout the body in one day and night. During the day, it circulates in the Yang aspect twenty-five times. (From the Foot-Taiyang Bladder Meridian to the Hand-Yangming Large Intestine Meridian; see details below.) At night, it circulates in the Yin aspect twenty-five times, cycling through the Five Zang Organs. (According to the text, the path proceeds from the Foot-Shaoyin Kidney Meridian to the Hand-Shaoyin Heart Meridian, Hand-Taiyin Lung Meridian, Foot-Jueyin Liver Meridian, and Foot-Taiyin Spleen Meridian,唯独 omitting the Hand-Jueyin Pericardium Meridian; this should be cross-referenced with other chapters. ○ The character "Sui" [Year] should be read as "Zang" [Organ], implying that Heaven's Yang governs the day, and Human Yang governs the Fu Organs, so Weiqi circulates in the Yang aspect twenty-five times during the day; Heaven's Yin governs the night, and Human Yin governs the Zang Organs, so it cycles through the Five Zang Organs at night.) Thus, at dawn, when Yin is exhausted, Yang Qi emerges from the eyes. (Jingming BL-1.) When the eyes open, Qi ascends to the head, follows the neck down along the Foot-Taiyang pathway, travels down the back, and reaches the tip of the little toe. (Zhiyin BL-67.) Its dispersed branches diverge from the outer canthus, descend to the Hand-Taiyang Small Intestine Meridian, and reach the lateral side of the little finger. (Shaoze SI-1.) Another dispersed branch diverges from the outer canthus. (Tongziliao GB-1.) It descends along the Foot-Shaoyang Gallbladder Meridian and enters between the fourth and fifth toes. (Qiaoyin GB-44.) Above, following the lateral aspect of the Hand-Shaoyang Sanjiao Meridian, it descends to the space between the little and ring fingers. (Guanchong TE-1.) A separate branch ascends to the front of the ear, merging with the collateral vessels of the mandible area. (Regions of Chengqi ST-1 and Jiache ST-6.) It injects into the Foot-Yangming Stomach Meridian, descends to the dorsum of the foot, and enters between the second and third toes. (Lidui ST-45.) Its dispersed branches descend from behind the ear, enter the Hand-Yangming Large Intestine Meridian, pass between the thumb and index finger, and enter the palm. Upon reaching the foot, it enters the sole, exits at the medial malleolus, descends into the Yin aspects, and finally converges back at the eyes, thereby completing one cycle.