What is the struggle between Niu Nv and Er?

"Cow and girl, two galaxies, left and right, two businessmen fighting" is a poem describing the position of stars in ancient astronomy. This sentence is used to describe specific constellations and stars and their relative positions.

In ancient times, people observed the position, brightness and movement of the sky and stars, thus forming a unique star system.

Niunv Erxing: Niunv Erxing refers to Gemini and is one of the twelve constellations. In the sky, Gemini is located on the ecliptic, where the sun, moon and planets run. Gemini consists of two brighter stars (Gemini α and Gemini β), and the image symbolizes two connected brothers.

Around the river: "Around the river" usually refers to the Milky Way, which was called "Tianhe" in ancient times and is our Milky Way. In the night sky, the milky way is banded and runs through the whole sky. In ancient culture, the Milky Way was often used to express the mystery, beauty and infinity in the sky.

Quotient: "Quotient" refers to Betelgeuse, also known as Betelgeuse. It is a star in Lyra, located in the Milky Way. "Two Obsidian" refers to the sun and the moon, which is a term used to describe the sun and the moon in ancient astronomy.

Dou: Dou, also known as the Big Dipper, is the abbreviation of the Big Dipper and an important constellation in ancient astronomy in China. The Big Dipper is the seven main stars of Ursa Major, arranged in a spoon shape. In ancient times, the Big Dipper was used to guide the direction and was an important tool in navigation, farming and other activities.

This sentence describes the ancient people's observation and cognition of constellations and stars in the sky. In ancient times, people made time systems such as lunar calendar and solar terms by observing the positions and movements of stars, used astrology to predict good or bad luck, and used constellations to inherit myths and legends handed down from generation to generation. This constellation culture reflects the ancient people's yearning and exploration of the universe, and is also the crystallization of ancient science and culture.