The same is applied here as stated in the first pome/tome above, i.e. "Being of an extreme nature it coupled with Extreme Yang shown above the first pome/tome above lead to the trigrams which also lead to the sixty-four hexagrams. The trigrams, hexagrams and all the Yao lines provide for the different levels of yang-yin in all things. There is never just Yang or just Yin in man who resides on Earth where Heaven and Earth, also extreme yang and extreme yin, create the myriad matter of life to include man. "
Blood is moved throughout the body by the heart. The blood circulates and with it circulates the energy of the Universe. Combination of the life giving blood along with the nutrients that supply the body the food it needs to generate energy along with various other practices, i.e. body mechanics, body alignment, mental and spiritual creates a "one" mind, body, spirit that equates to the ample life energy we call "Chi or Ki." When these three are in equilibrium then we can generate the energy manifest as Chi that the uninitiated sees as a mystical power that is actually normal and optimally utilized.
The sun and moon cling to Heaven, and grain, grass, and tress cling to Earth. When both Sun and Moon trigrams are used they represent the sun in the course of one day. The two together represent repeated movement of the sun, the function of light with respect to time.
The light of a setting sun calls to mind the fact that life is transitory and conditional. Like Heave and Earth the sun and moon can not exist with out one another and the balance created for the Earth is contingent on the energy pull of both which effects the myriad matter of Earth, i.e. wind, tides, etc.
The practice of karate-do teaches us to align the mind, body and spirit. Correct body alignment and mechanics associated with the various ways we use it, i.e. chinkuchi and gamaku along with kasha, that produce the proper health and energy producing Chi or Ki.
As can be seen the trigrams for moon and sun also connect us to the ears, eyes, and heart all of which also find meaning in the first tome of the ken-po- goku-i. It also reflects and connects us to the other six tomes or pomes of the goku-i according to its connection to Isshinryu and Okinawa Karate-do.
The first trigram is called "K'an" which represents the heart, the soul locked up within the body, the principal of light is enclosed in the dark - that is, reason. This trigram teaches the teacher; In teaching others everything depends on consistency, for it is only through repetition that the pupil makes the material his own.
K'an is also defined as "The Abysmal" which in China means, "pit." Its element is water and water shows how to behave; water is constantly flowing; man shows this through the constant virtuous life. Water flows on and on, so he makes use of practice and repetition in the business of teaching.
This is the moon or K'AN or The Abysmal or the heart, etc. which fills out and expands to encompass all eight tomes of the ken-po goku-i. We can see that the constant effects of the sun and moon if followed teach us how to practice and train in the art of karate.
The sun is fire which illuminates all things both physical and metaphysically, i.e. external and internal. The sun illuminates so the "eyes," both the ones we see our environment but also that "third" eye that sees the spiritual aspects of practice and life. Li/Sun/Fire is brightness that carries over to reflection of its power and energy when if reflects off the surface of the moon at night, darkness thus teaching us that the Sun illuminates that darkness that is within due to the body that encases our souls.
The sun and moon attain their brightness by clinging to Heaven, from which issue the forces of the light principle. This is why blood circulations is similar to sun and moon whose existence is solely due to the creative and receptive aspects of heave and earth through the eyes and ears, heart and soul, etc. of man.
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Chu, W. K. and Sherrill, W. A. The Astrology of I Ching. New York. Penguin Books. 1976
Wilhelm, Hellmut and Wilhelm, Richard. Understanding the I Ching: The Wilhelm Lectures on the Book of Changes. New Jersey. Princeton Bollingen Press. 1995.
Chu, W. K. and Sherrill, W. A. An Anthology of I Ching. London. Routledge and Kegan Paul. 1977.
Wilhelm/Baynes. The I Ching or Book of Changes. New York. Princeton Press. 1997.