What are the origins and customs of the summer solstice?

In the seventh century BC, our ancestors adopted and determined the summer solstice. The sun shadow measurement of Tugui is like this. Under the sunshine, erect a pole and see how long the shadow of the pole is on Tugui. The ancients comprehensively ensured the scientific rationality of the 24 solar terms through the synthesis of the sun, the moon and the stars, the phenological characteristics and the shadow measurement of the standard table.

Through the investigation of Tugui, we know that summer solstice is the longest day and the shortest night in a year, so summer solstice is also called long day. June 2 1 or 22 of the Gregorian calendar every year is the summer solstice, which means that the hottest summer has arrived.

The summer solstice 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 offering sacrifices to gods and ancestors to the Japanese. In the ancient farming society, when people lived and worked in peace and contentment, there were all kinds of regular festivals, and gradually formed some established celebration methods, which were called festival folk customs.

Extended data

The summer solstice means that the hot weather officially begins and then gets hotter and hotter, so there is a folk saying that the summer solstice is not too hot. From summer to the future, although the direct point of the sun gradually moves southward, the days in most parts of the northern hemisphere are shorter and the nights are longer, but the heat radiated by the sun to the ground is still more than the heat radiated from the ground to the air, so the temperature will continue to rise in the future.

During the summer solstice, the temperature is high, the sunshine is abundant, the crops grow rapidly and the water demand is high in most parts of China. At this time, precipitation has a great influence on agricultural output. During the solar term from summer to solar term, it is the rainy season in the south of China, and there is plenty of precipitation in the south.