What is the origin of long summer?

1. There is a legend about the origin of the solar terms in the Long Summer, which says that the legend of people in the Long Summer is related to Liu Chan, the ruler of Shu in the Three Kingdoms period.

2. At the end of the Three Kingdoms, Shu, ruled by the late Liu Chan, was already outnumbered. This year, the general of Wei was ordered to lead an army to attack Shu, and the soldiers forced Liu Chan to surrender. There was a loyal minister in Shu named Zheng, who proposed to Wargo that he should be a monarch. After surrendering to Dewey, he can't be abused at all, and he can't lose a little meat, otherwise he would rather die than surrender. Wargo agreed to this condition. After Liu Chan surrendered, he was taken to the capital of Wei at that time. Give him a house, 10 thousand silks and satins, and hundreds of beautiful women. Since then, Liu Chan has never been ashamed of national subjugation. The next year, he was called Liu Chan. The king of national subjugation not only didn't lose weight, but gained more than 20 kilograms. This day is summer.