What is a four-character idiom?

The change of stars refers to the change of the position of stars, and refers to the change of seasons or time. The Big Dipper revolves around the North Star from east to west, which is what ancient astrologers in China said. People can judge seasons and solar terms by laws.

China folk proverb: bucket handle refers to the east, and the world is spring; Guide to barrel handle, it's summer in the world; Bucket handle refers to the west, and the world is autumn; The barrel handle refers to the north, and it is winter all over the world. In other words, in the spring night, the bucket handle of the Big Dipper faces east; On a summer night, the bucket handle of the Big Dipper faces south; On autumn night, the bucket handle of the Big Dipper faces west; On winter nights, the bucket handle of the Big Dipper faces north.

Analysis of astronomical phenomena: The Big Dipper is an important astrology in the northern hemisphere sky. It consists of seven stars, including Shu Tian, Tian Xuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang (also known as Ursa Major). Named for its twists and turns.

The Big Dipper will appear in different directions in the northern hemisphere sky in different seasons and at different times at night, so the ancients identified seasonal changes according to the direction pointed by bucket handle at the beginning of fainting. The ancient book "Guo Guanzi" includes: bucket handle refers to the east, and the world is spring; Guide to barrel handle, it's summer in the world; Bucket handle refers to the west, and the world is autumn; The barrel handle refers to the north, and it is winter all over the world.

extended meaning

1, the basic meaning: Beidou changes direction and the stars move; Describe the passage of time and the changes of years.

2. Extended meaning: transfer one effect or thing to another.

3. Idiom origin: Ma Yuan Zhiyuan's "Chen Tuan Sleeps High" is the third fold: the sleeping tomb moves to the valley, the stone decays and the pine withers, and the stars move.