What does summer vacation mean? What is the connection between the two solar terms?

The connection of summer heat means that the two solar terms of summer heat and summer heat are connected. This sentence comes from "Twenty-four solar terms". Twenty-four solar terms were formulated by the ancients according to the ecliptic plane, belonging to the solar calendar category, and were concluded in the pre-Qin era. In the Han Dynasty, taichu calendar was absorbed as a supplementary calendar to guide farming. It was not only a time standard promulgated by governments in previous dynasties, but also a compass to guide agricultural production. People's compass for predicting cold, warm, rainy and snowy weather in daily life is the crystallization of the long-term experience and wisdom of Chinese working people.