This picture comes from Yi and should be the oldest original Bagua picture. This picture has only six directions, lacking the east-west direction. It was obtained by the primitive observation and timing method, while the first and the day after tomorrow diagram has eight directions, and represents the product of 's shadow measurement and teaching method.
The picture on the left is Tai Chi diagram . Tai Chi generates yin and yang, yin and yang generates heaven and earth, Qianyang, Kunyin and Yin have mutual roots and mutual origins. One is declining and the other is growing, and the other is advancing and retreating.
The picture on the right is a popular picture of Liuzi Yin and Yang. In the middle are Qianfu and Kunmu, and the outer circle is Liuzi Gua. Kun Suo Qian gets three sons: Zhen, Kan, and Gen, and the yang is relieved from the yin. Qiansuo Kun got three women, Xun, Li, and Dui, and the yin eliminated the yang.
Up south and down north, the three hexagrams Xun, Li, and Dui in the south, the sun rises and sets in the south, and the overcast in the north is winter. The three hexagrams of the north are Zhen, Kan and Gen. The sun rises and sets in the north, and the Yang in the north is summer.
Six sons are born from the intersection of Qian, Yang, Kun, and Yin. With six sons, there is no need for Qian and Kun. There is no need for the father to come forward to have a son. "Qian Tu" says: "At the end of the Ming Dynasty, six people were formed at the time, and they rode on six dragons to control the sky." The Ming Dynasty refers to the time of spring, summer, autumn and winter. The six dragons are also the six sons. The six positions are the six lines, and the six sons are on duty.
Those who succeed in the future will advance, and those who succeed will retreat. It is expensive at that time, but it is cheap after it has been used. Qian and Kun give birth to six sons, and Qian and Kun retire after their achievements are completed. The six sons are used without Qian and Kun. Heaven uses six as a knot, and each of the six sons controls one Qi. After the six sons have been used, they return to the universe. Heaven and earth cycle again and again. The cycle of spring, summer, autumn and winter is endless and endless.
The hanging symbol represents nothing greater than the sun and the moon. Both the solar calendar and the lunar calendar are based on the natural movement of the sun and the moon. It is impossible to calculate the time of the winter solstice, summer solstice, spring equinox, and autumnal equinox, and it is also impossible to accurately divide the southeast, northwest, and their time positions. The vagueness is due to the natural calendar, so the original hexagram diagram has north and south but no east and west directions.
Fuxi came out, measured the whole body, measured the time by measuring the shadow of the Gui watch, measured the square and the circle to determine the four directions, the directions of southeast, northwest and northwest were accurate, the two to two points were clear, the six sub-diagrams were transformed to obtain four straight and four corners, successive days Bagua diagram be established.
Bagua diagrams all evolved due to the progress of ancient astronomy. The development of standard timepieces, engraving and omission timing, and precise timing promoted the birth of the twenty-four solar terms based on the four-point calendar, and the "Book of Changes" went into other directions.
