What does the connection of the song median value of the twenty-four solar terms mean and what does it mean?

"Summer connection" means that summer meets summer, which is two adjacent solar terms. Solar term song's content is: Spring rains shake the valley, summer is full and summer is even. Autumn dew, autumn frost, little snow in winter and cold in winter. The two festivals remain unchanged every month, with a maximum difference of one or two days. The first half of the year is June 2 1 day, and the second half is August 23.

Among the 24 solar terms, there are five solar terms reflecting the temperature change: little summer, big summer, midsummer, slight cold and great cold. There are seven solar terms reflecting weather phenomena: rain, Grain Rain, white dew, cold dew, first frost, light snow and heavy snow. There are four solar terms reflecting phenological phenomena: Jing Zhe, Qing Ming, Xiaoman and Mang Zi. The solar terms reflecting the changes of the four seasons are: beginning of spring, Spring Equinox, Long Summer, Summer Solstice, beginning of autumn, Autumn Equinox, beginning of winter and Winter Solstice.