The solstice in winter has the longest solar term night.

On the winter solstice, the longest night is the shortest day, so after the winter solstice, the day is getting longer and longer. This is the "winter solstice", which means that after the winter solstice, the days begin to get longer.

In addition, the summer solstice has the shortest night and the longest day, so after the summer solstice, the day is shorter day by day, which means "the summer solstice is very short"

Another meaning is that the sun shadow is the longest in winter solstice. Therefore, it is "the winter to the sun is long", and the sun shadow is the shortest from summer to the sun. So it is "the summer of solstice is very short"

Winter solstice, also known as winter festival, Asian New Year Festival and Long Day Festival, has both natural and humanistic connotations. It is not only an important solar term among the 24 solar terms, but also a traditional folk festival in China.

The winter solstice marks the minimum height of the sun and the shortest day in the northern hemisphere, but the temperature in winter solstice is not the lowest.

On the solstice of winter, the sun shines directly on the ground and reaches the southernmost tip of the year. The sun shines almost directly on the tropic of Capricorn (also known as the winter solstice daily line), and the sun is most biased towards the northern hemisphere. Therefore, in all parts of the northern hemisphere, the winter solstice is the shortest day in a year, and the farther north, the shorter the day.

Summer solstice was also called "Summer Festival" and "Summer solstice Festival" in ancient times. It is not only one of the 24 solar terms, but also a festival in the ancient folk "four seasons and eight festivals". Since ancient times, there has been a custom of worshipping gods and ancestors on the solstice in summer to pray for disaster relief and bumper harvest.

On the day of summer solstice, the position where the sun shines directly on the ground reaches the northernmost part of the year, almost directly on the tropic of cancer. At this time, the daylight hours in all parts of the northern hemisphere reach the longest in the whole year.