The meaning of this sentence is that the winter solstice is held from December 21st to 23rd in the Gregorian calendar every year. After this day, the nights become shorter and the days become longer.

The winter solstice is basically between December 21 and 23 of the solar calendar every year. On this day, the sun moves to 270 degrees of ecliptic longitude, and the sunlight almost directly shines on the Tropic of Capricorn. The northern hemisphere has the shortest day and the longest night, so the winter solstice In the past dynasties of our country, it was also called "Rishort", "Rishort" and "Rinan solstice".

In the Northern Hemisphere, after the autumnal equinox, the days get shorter and the nights get longer, until finally the winter solstice arrives. Although the winter solstice is the fourth winter solar term among the twenty-four solar terms, it is the earliest one to be formulated among the twenty-four solar terms, and is known as the first of the twenty-four solar terms. The ancients believed that from the winter solstice, the yang energy of heaven and earth begins to rise and strengthen, and the next cycle begins, during the longest days of darkness.

Extended information:

Be careful to keep warm after the winter solstice.

Although the days are getting longer and longer after the winter solstice, it is not the day when the temperature in the northern hemisphere begins to rise. On the contrary, from the winter solstice, what we often call the "three-nine days" begins, and every day a petal is drawn. The first petal is also drawn on the day of the winter solstice. The winter solstice is not the day with the lowest temperature, but from this day on, winter in the northern hemisphere gradually enters the coldest season of the year.

Winter collects and breeds. Life lies dormant under the white snow and in the frozen soil, waiting for the arrival of spring. For us, winter is also a great time to stay healthy, especially the winter solstice.

Because "qi begins at the winter solstice", life activities change from decline to prosperity and from quiescence from the winter solstice. Therefore, seizing the good opportunity of the winter solstice to start targeted supplements can not only ensure strong energy and prevent Premature aging can also achieve the purpose of prolonging life.

Xinhuanet - "Winter Solstice" at 0:28 on the 22nd: the days begin to get longer and the sun begins to rise

People's Daily Online - "Winter Solstice" arrives and the sun begins to rise