Introduction of beginning of winter in the Twenty-four Solar Terms

Beginning of winter is the 19th of the 24 solar terms and the beginning of winter.

Bucket handle points to the northwest, and the longitude of the sun reaches 225, which intersects the Gregorian calendar165438+1October 7-8 every year. Stand still, build the beginning; In winter, everything will be collected in the end. Beginning of winter means that anger begins to close and everything enters a state of recuperation. Its climate has also changed from dry autumn to rainy and cold winter.

The commonly used methods of season division mainly include "solar terms method" and "temperature method". China traditionally takes the "beginning of winter" with "twenty-four solar terms" as the beginning of winter; The winter divided by the "solar terms law" means that everything enters a state of recuperation. According to the "temperature method", winter begins when the average temperature of the day falls steadily below 10℃ for five consecutive days. Winter divided by temperature means cold weather.

The origin of the twenty-four solar terms:

"Twenty-four solar terms" is the product of ancient farming civilization. It is a special festival in the trunk calendar to express the change of natural rhythm and establish "December" (month). "Twenty-four solar terms" and "December" are the basic contents of the elephant trunk calendar. The twenty-four solar terms were originally formulated according to the changes of stars. The Big Dipper consists of seven stars, including Shu Tian, Tian Xuan, Celestial Pole, Tianquan, Yuheng, Kaiyang and Yaoguang. It is named after the twists and turns of the Big Dipper.

The Big Dipper is an important astrological sign in the northern hemisphere (China is located in the northern hemisphere), and the natural rhythm of the corresponding area in the northern hemisphere is gradually changing when the stars change, so it has become the basis for the ancients to judge the change of solar terms, that is, the so-called "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; Bucket handle refers to the north, and the world is winter. ". Because the 24 solar terms are determined by the rotation direction of Beidou bucket handle, this calendar is also called "ephemeris".

Refer to the above content: Baidu Encyclopedia-beginning of winter