When is beginning of spring on February 4th?

Beginning of spring, as the first of the "twenty-four solar terms", is the beginning of a year in the official calendar, the beginning of everything, and represents the beginning of everything and the meaning of self-improvement. "Twenty-four solar terms" was originally determined according to the bucket handle rotation direction of the Big Dipper, and the bucket handle rotation was circular, which was closely related to the twenty-four solar terms.

The Big Dipper is made up of seven stars: Shu Tian, Tian Xuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang, hence its name. The Big Dipper is an important astrological sign in the northern hemisphere (China is located in the northern hemisphere). When the stars change, the natural rhythm of the northern hemisphere and its nearby specific areas is gradually changing, which has also become the basis for ancient people 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. ". In ancient astronomy, bucket handle called the Big Dipper "the sword", which represents the direction of the top of bucket handle. "Building in December" and "Twenty-four solar terms" are the basic contents of the calendar. One year (Jian 'an) is divided into twelve years (Jian 'an in December) in the calendar of official branches, and bucket handle turns to twelve years in turn (that is, the twelve branches are "Chen … Zi Chou").