What does ternary mean?

Astronomers in ancient China divided the stars of celestial bodies into three constellations, twenty-eight constellations and other constellations. Sanyuan is a general term for Thai flavor source, Ziwei source and Tianshiyuan. Wang Songying-lin's "The Pearl of Primary School: Three Walls": "Three Walls: The upper wall is ten stars small, the middle wall is fifteen stars purple, the lower wall is twenty-two, and the third wall is forty-seven." Zhang Ming Juzheng's "Palace Story": "The three major capitals are magnificent and stand in the north and south. For example, the three walls are beautiful, and the place in Taiyi is more residential. " In the Qing Dynasty, Cao Yin's poem "Looking at the Moon and Showing the Son on the Yellow River" reads: "It's gloomy and gloomy, swaying on three walls."

Word decomposition

The interpretation of "three" is three names, two plus one ("three" is often capitalized on banknotes and documents): three-dimensional space. Trilogy. Three kingdoms (Chinese dynasty names). Look before you leap. Shut my mouth. Radical:1; Interpretation of wall × low wall, wall: low wall. City wall. City wall. City: provincial wall (provincial capital). Official position: Jianyuan (official position). In ancient times, stars were divided into upper, middle and lower walls. Last name. Radical: the earth.

Modern astronomy was introduced into China from the west, and astrology was accepted by China people with the spread of western culture. On the contrary, people know little about ancient astronomy in China. Ternary is one of the essences of ancient astronomy in China. In ancient China, the division method of the starry sky was the star official system, and the ternary system was a very important three-star official division. It refers to three areas around the Arctic sky, namely, the upper wall is too small, the middle wall is purple, and the lower wall is the sky and the city. Each of these three walls is a relatively large sky area.