What do you mean the local sky is round?

The land of heaven and earth is a manifestation of the theory of yin and yang, and it is the understanding of the universe by ancient science.

The ancients called the state where heaven and earth were indistinguishable and chaos began to open, and Tai Chi gave birth to two devices, which separated yin and yang and heaven and earth.

The ancients called the vast universe composed of many stars "heaven" and the field they lived in "earth", because the sun, the moon and other celestial bodies are moving endlessly, like a closed circle with no starting point and no ending point; But the earth is quietly taking us there, just like a square object is static and stable, so the concept of "a round place" has emerged.

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Architectural philosophy

Traditional architecture in China pays more attention to perfection.

The Temple of Heaven and the Ditan built in Beijing during the Ming and Qing Dynasties were all built according to the principle of harmony between heaven and earth. The Temple of Heaven is round, and the number of dome layers, the diameter of the table top and the railings around it are singular, that is, the number of yang, which symbolizes that the sky is yang; The altar is square and has eight steps on all sides, all of which are even numbers, that is, the number of yin, with the symbolic ground as yin.

Ordinary people often build a round pool in a small square yard, or build a round moon gate between two houses, which are the embodiment of a round place. The quadrangle in the north is a typical representative of the theory of heaven and earth.

Baidu encyclopedia-Tianyuan Tiandi