When does summer start?

From summer to the first Geng day in the future. That day was summer, ten days was a summer, and * * * three summers. It is called early summer fever, heatstroke and late summer fever in turn.

Summer solstice was also called "Summer Festival" and "Summer solstice Festival" in ancient times. The ancients said: "The days are long, the shadows are short and extremely extreme, so it is called the summer solstice." The summer solstice is when the sun moves to 9 degrees of the yellow meridian, usually on June 2 1 ~ 22 of the Gregorian calendar. On the solstice of summer, the sun shines directly on the Tropic of Cancer. At this time, the daytime in all parts of the northern hemisphere reaches the longest in the whole year, and the higher the latitude, the longer the daytime. For the Tropic of Cancer and its northern area, the summer solstice is also the highest day of the year at noon.

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. "Heaven and earth are the foundation of life; Ancestors are the foundation of class. " Heaven and earth are the foundation of life, ancestors are the foundation of life, and ancestor worship is the custom of inheriting filial piety. In addition, there are folk customs such as "avoiding summer and hiding" and "clearing the field" from summer to Japanese.