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司天通主上半年，在泉通主下半年。
以在下在泉言，是面南而命其位，所谓左者东而右者西也。
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甲己二干，统六十花甲为终始，又以土居中宫，而驭四方，故十干内，惟甲己为君，南面以行令而为南政；
其余乙丙丁戊庚辛壬癸八干，皆为臣象，北面以受令而为北政。南政、北政所在当少阴之位，脉即不应，不应
者，谓其沉细不应本脉也。当应不应与不当应而应，谓之阴阳交，尺寸反，斯为害也。
南政之年，南面行令，其气在南，所以南为上而北为下，司天应上，在泉应下。人气亦应之，故寸为上而
尺为下，左右俱同，天之左为西，右为东，间为右寸。
北政之岁，北面受令，其气在北，所以北为上而南为下，在泉应上，司天应下。人气亦应之，故尺应上而
寸应下，司天应两尺，在泉应两寸。地之东为左，左间西为右，右间为左寸，天之左间为左尺，右间为右尺。
南政∶少阴司天，两寸不应；厥阴司天，右寸不应；太阴司天，左寸不应；少阴在泉，两尺不应；厥阴在
泉，左尺；太阴在泉，右尺。
北政∶少阴司天，两尺；厥阴司天，左尺；太阴司天，右尺；少阴在泉，两寸；厥阴在泉，右寸；太阴在
泉，左寸。
六气司天图 [图片：pt28a3.bmp]
司天之气统管上半年的气候，在泉之气统管下半年的气候。
以在泉之气的位置而言，是面向南方来确定方位的，这就是所谓的左边为东、右边为西。
[图片：pt28ad.bmp]
甲年和己年，统领六十个花甲子作为终始循环，又因为土居中宫而驾驭四方，所以在十天干中，只有甲和己属于君象，面向南方行使政令，称为南政；
其余乙、丙、丁、戊、庚、辛、壬、癸八个天干，都属于臣象，面向北方接受政令，称为北政。在南政或北政之年，当少阴（Shao Yin, Lesser Yin）所在的位置，脉象就会不应指（pulse not felt），所谓“不应”，是指脉象沉细而不符合正常的脉象特征。应当出现不应指的情况而没有不应指，或者不应当出现不应指的情况却出现了不应指，这叫做阴阳交（Yin-Yang Intersection，指脉证不符的逆证），尺寸反（Reversal of Cun and Chi positions，指寸尺脉位异常），这是有害的。
在南政之年，面向南方行使政令，其气位于南方，所以南方为上、北方为下，司天之气对应上部，在泉之气对应下部。人体的气也与之相应，所以寸口（Cun Kou, radial artery at the wrist crease）为上、尺部（Chi position, distal part of the radial pulse）为下，左右手情况相同。天的左边是西方，右边是东方，右间气对应右寸口。
在北政之年，面向北方接受政令，其气位于北方，所以北方为上、南方为下，在泉之气对应上部，司天之气对应下部。人体的气也与之相应，所以尺部对应上部、寸口对应下部。司天之气对应两尺部，在泉之气对应两寸口。地的东方为左，左间气在西方即为右，右间气对应左寸口；天的左间气对应左尺部，右间气对应右尺部。
南政之年：
少阴司天，两寸口脉不应指；
厥阴（Jue Yin, Terminal Yin）司天，右寸口脉不应指；
太阴（Tai Yin, Greater Yin）司天，左寸口脉不应指；
少阴在泉，两尺部脉不应指；
厥阴在泉，左尺部脉不应指；
太阴在泉，右尺部脉不应指。
北政之年：
少阴司天，两尺部脉不应指；
厥阴司天，左尺部脉不应指；
太阴司天，右尺部脉不应指；
少阴在泉，两寸口脉不应指；
厥阴在泉，右寸口脉不应指；
太阴在泉，左寸口脉不应指。
Chart of the Six Qi Presiding over Heaven [Image: pt28a3.bmp]
The Qi presiding over heaven (Si Tian) governs the first half of the year, and the Qi issuing from the earth (Zai Quan) governs the second half of the year.
Regarding the position of the Qi issuing from the earth, it is determined by facing south, which is referred to as "left being east and right being west."
[Image: pt28ad.bmp]
The Heavenly Stems Jia (Wood) and Ji (Earth) encompass the sixty Jiazi cycles as their beginning and end. Furthermore, since Earth resides in the Central Palace and commands the four directions, among the Ten Heavenly Stems, only Jia and Ji represent the Sovereign aspect. They face south to issue decrees, thus constituting the Southern Polarity (Nan Zheng).
The remaining eight stems—Yi, Bing, Ding, Wu, Geng, Xin, Ren, and Gui—all represent the Minister aspect. They face north to receive decrees, thus constituting the Northern Polarity (Bei Zheng). In years of either Southern or Northern Polarity, where Shao Yin (Lesser Yin) is located, the pulse will be "non-responsive" (bu ying). "Non-responsive" refers to a pulse that is deep and thin, failing to reflect the normal pulse characteristics. If non-responsiveness occurs when it should not, or fails to occur when it should, this is termed Yin-Yang Intersection (Yin Yang Jiao), indicating a reversal of the Cun and Chi positions (Cun Chi Fan), which is detrimental.
In years of Southern Polarity, facing south to issue decrees, the Qi is situated in the South. Therefore, South is superior (upper) and North is inferior (lower). The Qi presiding over heaven corresponds to the upper, and the Qi issuing from the earth corresponds to the lower. Human Qi also responds accordingly; thus, the Cun position (distal radial pulse point) is superior and the Chi position (proximal radial pulse point) is inferior. This applies equally to both left and right hands. In the cosmic orientation, the left is West and the right is East. The Right Intercalary Qi corresponds to the Right Cun position.
In years of Northern Polarity, facing north to receive decrees, the Qi is situated in the North. Therefore, North is superior (upper) and South is inferior (lower). The Qi issuing from the earth corresponds to the upper, and the Qi presiding over heaven corresponds to the lower. Human Qi also responds accordingly; thus, the Chi position corresponds to the upper and the Cun position corresponds to the lower. The Qi presiding over heaven corresponds to both Chi positions, and the Qi issuing from the earth corresponds to both Cun positions. Geographically, East is Left; the Left Intercalary Qi is in the West, hence it is Right, and the Right Intercalary Qi corresponds to the Left Cun position. Cosmically, the Left Intercalary Qi corresponds to the Left Chi position, and the Right Intercalary Qi corresponds to the Right Chi position.
Southern Polarity:
- When Shao Yin presides over heaven, both Cun pulses are non-responsive.
- When Jue Yin (Terminal Yin) presides over heaven, the Right Cun pulse is non-responsive.
- When Tai Yin (Greater Yin) presides over heaven, the Left Cun pulse is non-responsive.
- When Shao Yin issues from the earth, both Chi pulses are non-responsive.
- When Jue Yin issues from the earth, the Left Chi pulse is non-responsive.
- When Tai Yin issues from the earth, the Right Chi pulse is non-responsive.
Northern Polarity:
- When Shao Yin presides over heaven, both Chi pulses are non-responsive.
- When Jue Yin presides over heaven, the Left Chi pulse is non-responsive.
- When Tai Yin presides over heaven, the Right Chi pulse is non-responsive.
- When Shao Yin issues from the earth, both Cun pulses are non-responsive.
- When Jue Yin issues from the earth, the Right Cun pulse is non-responsive.
- When Tai Yin issues from the earth, the Left Cun pulse is non-responsive.