"Chinese Astronomical Almanac" shows that Beijing time on December 21, 18:02 will usher in the "winter solstice" festival, from this day onwards, our country began to enter the "count nine cold days" season, folk commonly known as the "into nine". Into nine".

Annual calendar December 22 or so for the "winter solstice", it is the twenty-four seasons in the twenty-second season, is also the fourth winter season. Contrary to the corresponding "summer solstice", "winter solstice" this day, the sun almost directly to the Tropic of Capricorn, is the northern hemisphere in the year the shortest day, the longest night of the day, the ancient name of "day short" or The ancient name for this day is "short day" or "short solstice". "After the winter solstice, the sun's point of direct sunlight slowly moves northward, the northern hemisphere, the day gradually becomes longer, the night is gradually shortened.

The winter solstice is a key moment in the year when yin and yang are in transition, when yin energy declines and yang energy rises, and when springs begin to sprout underground, marking the end of winter and the beginning of spring. But in the astronomical sense, the "winter solstice" means that the winter should come. This is because from the "winter solstice" began, the northern hemisphere ground heat loss than the absorption of heat, to "three nine" before and after the ground heat accumulation drops to a minimum, the weather is the coldest, so there is a "one nine two nine do not go out, three nine Four nine ice walk" and "cold in three nine" said.

Folk believe that "gas begins at the 'winter solstice'", so this is the best time for health. "'Winter solstice' make up a complement, a year of essence enough. Supplementation should pay attention to the "kidney and cold", eat more warm supplement yang, strong kidneys and bones, yin yi gas food, such as mutton, yam, lotus seeds, jujube, etc., in order to increase the calorie. In order to adapt to the cold winter "everything rest, Yang Qi hidden" law, it is appropriate to follow the "sleep early and get up late, must wait for daylight" principle, in order to nourish the spirit. After the lunch break, Yang Qi is strong, is the best time to exercise, but the intensity should be moderate, in order to slightly sweating as a principle. "Winter Solstice" health, focusing on the heart, to quiet body, optimism, not for trivial matters, in order to prevent premature aging, to maintain strong energy, can be beneficial to life and prolonged.