Hi Marty -

The movement of daytime wei qi is found in The Spiritual Influence Pivot (Ling Shu): "During the daytime, the defensive qi moves from the tai yang to the shao yang to the yang ming and then returns through the yin."¹ This flow of wei qi is like a cascade from the eyes to the toes. The return through the yin takes place through any of the yin channels, including the yin walker vessel (yin qiao mai).

The discussion is primarily in the context of the six channel theory rather than the twelve channel theory. The length of day and night is variable. Young Wei-jieh approaches the problem by averaging 25 circles in the day and the night a whole day is 50 times. I calculate it at 29 minutes and 10 seconds with 1440 minutes in a day divided by 50.  However, as a practical matter, I round off to a 1/2 hour. This is one of the theories behind the 1/2 long needle retention method.

Will

William R. Morris, DAOM, MSEd, LAc
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