There are winter solstice and summer solstice in China lunar calendar, and summer solstice corresponding to winter solstice is the longest day in a year. After the summer solstice, the days will get shorter and the nights will get longer. According to the theory of ancient Chinese, the solstice in summer is the moment when the yang flourishes and the yin declines to the extreme, and the yin starts to climb from this most declining node. After half a year in summer, half a year in autumn and half a year in winter, the process of yin rising and yang descending reaches the extreme, which is the "winter solstice". On the winter solstice, the night is the longest and the day is the shortest, which is completely opposite to the summer solstice.

As an ancient agricultural civilization, our ancestors were very sensitive to the changes of yin and yang in nature. Spring, long summer, autumn harvest and winter storage all depend on the weather for food. Planting crops all year round depends on the care of the sun. In winter, especially in the winter solstice, the care for the sun is at its lowest point and seems to be the darkest. However, according to the dialectical view of the ancients, the shortest day and the longest night will definitely change things. On the solstice of winter, everything will start a new round of vitality. Of course, ancestors should regard it as a grand holiday commemoration. They commemorated the great change of the day from shortening to lengthening.

So, what should we do on this day? Save your strength, wait for it to change, and wait for it to start again with a bang. In modern society, it is certainly impossible to travel, but it is good to remember the reminder of nature. The ancients regarded the winter solstice as a festival, which contained a nation's advanced understanding of adapting to nature and recuperating. Our ancestors told us that we should listen to the changes of nature sensitively, face the coming Sun Long and Longyin from winter solstice, take good care of ourselves, and wait for and welcome this change.

From the understanding of winter solstice, it can also be transformed into human health rules. The ancients advocated that sitting still on the solstice in winter was good for health. If this principle is extended to 365 days a year, it can be said that every day contains a small "winter solstice". According to the timing method of the ancients, every day there is a process in which yin disappears and yang declines and yin flourishes, and midnight is the moment when yin flourishes and yang declines to the extreme. At this moment, whether you are resting or sitting for health, you will get unusually good results. After winter, although the nourishment of nature will make the yang flourish day by day, don't forget that the arrival of winter also means entering the coldest stage of the year, that is, the so-called freezing. Keep the yang in your heart, keep your vision for the future, and keep peace in the shorter and shorter night.