According to the history book Yao Dian, Yao treats the world at peace: he commands peace and respects the sky, like the sun, the moon and the stars, and respects people. Later, he, he, he and his uncle were ordered to go to all directions, which was the earliest theory and practice of a round place. From the book Hutuluo, it can be proved that the sky is round, but without today's accurate understanding, it gave birth to a simple world view. The earth refers to the horizon coordinate system, and the square refers to the azimuth or orientation, that is, the child represents the north, the afternoon represents the south, the unitary represents the west, and the wool represents the east. Twelve earthly branches, ten heavenly stems and four hexagrams represent twenty-four directions and are built on the whole Sunday (360-degree circle). This is the sky.
The land of heaven and earth is a map of heaven and earth that evolved from the innate gossip Book of Changes, that is, a map of heaven and earth? . Among them, the hexagrams around the periphery represent the operation law of the sky, and the hexagrams arranged in the middle square represent the operation law of the earth. The sky is dominant, the earth is secondary, the sky is yang, and the earth is yin. The interaction between them leads to the creation of everything in the world.
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In essence, the land of heaven and earth is an explanation of the generation and operation of heaven and earth in the yin and yang system of Yijing, the first of the hundred classics and the source of Chinese studies. Its ideological system holds that everything evolves according to Yin-Yang and Five Elements, so all ancient disciplines have the ideological system of Yin-Yang and Five Elements.
References:
Baidu encyclopedia-Tianyuan Tiandi