What are the dates of the Great Summer and the Great Summer respectively?

Little summer is on July 7th (July 6th to July 8th), and big summer is on July 23rd (July 22nd to July 24th).

On July 7th or 8th every year, when the sun reaches longitude 105, it is considered as a slight summer high temperature. Hot in summer means hot. The ancients believed that the period of great summer heat was less than the hottest time of the year, so it was called great summer heat. There is also a solar term ballad: "Little summer is not hot, big summer is three days." The hottest period of the year has arrived, but it has not reached the extreme heat level.

The summer heat is the twelfth solar term in the twenty-four solar terms of the lunar calendar and the sixth solar term in summer. The sun is located in the yellow meridian 120. This means that the weather is very hot and the hottest period is coming. At this time, most areas of China are the hottest period in a year, and the growth rate of heat-loving crops is the fastest.