The origin of winter solstice: the explanation of primary school students

The winter solstice is an important solar term among the 24 solar terms in the China lunar calendar, and it is also a traditional festival of the Chinese nation. The winter solstice is a "winter festival", so it is considered as a big holiday in winter. In ancient times, there was a saying that "the winter solstice is as big as a year".

The winter solstice falls on the Gregorian calendar 65438+February 2 1 ~ 23 every year. It is worth noting that around the winter solstice, the earth is located near the perihelion, and its running speed is slightly faster, resulting in that the time of direct sunlight in the southern hemisphere is about 8 days shorter than that in the northern hemisphere in a year, so the winter in the northern hemisphere is slightly shorter than that in summer.

The ancients said: When the cathode arrived, the yang began to grow, the sun went south, the day was short and the shadow was long, so it was called "winter solstice day". The ancients believed that since the winter solstice, the yang of heaven and earth began to get stronger, that is to say, the next cycle began, and the yang of heaven and earth rose again in the winter solstice, which was called "auspicious day"