The winter solstice is a fleeting year, and it is warm and moving. "On the winter solstice, one yang is born and comes and goes." The "arrival" of the winter solstice does not mean coming, but rather the extreme and most profound meaning. The winter solstice means that at this time, the yin energy between heaven and earth has reached its peak of the year, and the yin energy is at its peak and declining. After the winter solstice, the yang energy also begins to sprout. This day is also the shortest day when the sun shines directly on the Tropic of Cancer and the Northern Hemisphere, so the Winter Solstice is also known as the "Short Solstice"