March 08, 2012
Qi Men Dun Jia
The Qi Men Dun Jia (奇門遁甲) discussed in chapter 17 of Serpent of Time is a school of astrology based on astronomical observations and Chinese metaphysics. It is widely used today, as a component of the Luo Pan or Feng Shui compass.
As with blood type divination, the conviction that important activities should be initiated on "auspicious dates" has not diminished in Japan, Korea and China, modernity notwithstanding (or, as with blood type, thanks to modernity).
Of course, as they say, there's an app for that (note the magic square in the center of the compass circle).
In Japanese and Chinese folklore, the more tails a fox spirit has--as many as nine--the more powerful it is.