What is the meaning and origin of Chushu?

What is the meaning and origin of Chushu?
After the Beginning of Autumn, the weather gradually becomes cooler. Want to know more about the End of Heat solar term? What are the taboos and precautions in the lunar calendar for July? The special topic on the seventh month of the lunar calendar in 2021 has also provided answers for you. You can click on Shuimo.com to check the seventh month of the lunar calendar in 2021.

What does the End of Heat mean?

Chushu, which means "out of summer", means the heat is leaving, representing that the hot summer weather is about to pass.
The Beginning of Autumn means that the extremely hot weather is coming to an end. Although the weather is still hot during this period, it is showing a downward trend. During the Beginning of Autumn, the sun's direct point continues to move southward, solar radiation weakens, the subtropical high pressure also retreats southward, the temperature gradually drops, and the heat gradually disappears.
Chushu is one of the 24 solar terms that reflects climate change. It also means entering the second half of the Shen month in the Ganzhi calendar. In Yuan Wu Cheng's work "Collected Explanations of the 72 Seasonal Changes in the Lunar Calendar", it says: "Chu means to stop, and the hot summer ends here." "Chu" means to end, indicating that the heat is about to pass and the hot summer will end. End of Heat, mid-July. Chu means to stop. The summer heat ends here.

What is the origin of the End of Heat?

Chushu is one of the 24 solar terms and the second solar term in autumn.
During the Beginning of Autumn, the handle of the Big Dipper points to the southwest (position Wu), and when the sun reaches 150° of the ecliptic longitude, the intersection point is around August 23 of the Gregorian calendar. On the day of the Beginning of Autumn, the sun’s direct point has moved southward from 23°26′ north latitude on the day of the Summer Solstice to 11°28′ north latitude. As the sun's altitude continues to decrease, the heat it brings also weakens. At this time, if you observe the Big Dipper at night, you will find that the curved handle is still pointing to the southwest.
The 24 solar terms are the product of ancient agricultural civilization. It is a knowledge system formed by ancient ancestors who adapted to farming time and observed the movement of celestial bodies to understand the changing laws of seasons, climate, and phenology in a year. The 24 solar terms were originally established based on the movement of the stars. The Big Dipper rotates in a circle, and the handle of the Dipper rotates one circle clockwise, which is called a "year" (Sheti). The current 24 solar terms are formulated based on the position of the sun on the tropical ecliptic, that is, the sun's annual motion trajectory is divided into 24 equal parts, each 15° is 1 equal part, and each 1 equal part is a solar term, starting from the Beginning of Spring and ending with the Great Cold, and the End of Heat is one of them.

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