When is the solstice in winter?

The winter solstice is the 22nd of the 24 solar terms. "Twenty-four solar terms" and "December architecture" are the basic contents of the calendar. The "Twenty-four solar terms" were originally determined by the rotation direction of bucket handle-Big Dipper, and the bucket handle rotates in a circle, which is closely related to the twenty-four solar terms. At different times in different seasons, the Big Dipper will point in different directions, which has also become the basis for the ancients to judge the changes of seasonal solar terms, that is, the so-called "bucket handle refers to the east, and the world is spring; The guide to barrel handles, it is summer all over the world; Bucket handle refers to the west, and the world is autumn; It refers to the astrological law that northern bucket handle is winter. In traditional culture, nourishment is linked to position and gossip, and the position of yin is the acquired "root position" of gossip. It is the position at the end of the year and the beginning of the year, representing the end and the beginning. For example, "Yi Shuo Gua Zhuan": "The root is also the divination in the northeast, and the beginning of all things is also. "Starting from the east to the north of bucket handle (Yin position, the root of the acquired gossip) and rotating clockwise for one week, it is called one year old (figure), and beginning of spring is the beginning of a year. When bucket handle points to the "lower" position of due north, it is the solar term from the winter solstice to the sun.