The nine heads in the 24 solar terms refer to

The spring rain shakes the spring and clears the valley, and the summer is full of mountains and summers. 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.

The content and explanation of the ninth song;

1929 did not shoot; Walking on the ice in 3949; On May 9th, June 9th, I watched willows along the river, on July 9th, the river opened, on August 9th, Yanlai, on September 9th, plus nineteen, and plowed cattle everywhere.

1929 After the winter solstice, the weather is cold, and putting your hands outside will be unbearable and even cause frostbite, so you can't help but put your hands in your pockets. This is "not doing it."

3949 is the coldest season of the year. There is thick solid ice in the river, so pedestrians can walk safely on the river.

At the coldest time, in May 1969, the weather began to get hotter, the river planted with willow branches began to sprout, and everything gradually recovered to eliminate the winter depression, and people could not help but see willow trees.

When the ice and snow begin to melt, the frozen river will slowly thaw and the sound of water will be heard. In warm weather, swallows will fly back from the south to nest and start a new round of busy and endless cycle.

99 is a wake-up call in the 24 solar terms. The weather is getting warmer, and there is spring water gradually. The weather has been warmer. Most parts of China have entered the spring ploughing season, and busy cows are everywhere, which indicates new hope and a new beginning.