The spring rain shocks the spring and clears the valley, and the summer is full of mountains and summer heat.

Autumn is exposed, autumn is cold and frost, and winter snow is small and winter is cold.

The two festivals are unchanged every month, with a difference of one or two days at most.

In the first half of the year, it will be June 21, and in the second half, it will be August 23.

Extended data:

The origin of the festival;

As early as the Spring and Autumn Period and the Warring States Period, China used Tugui to measure the sundial in ancient times (that is, to measure the length of the sun's shadow at noon by erecting a pole on the plane) to determine the four solar terms of vernal equinox, summer solstice, autumnal equinox and winter solstice.

In a year, the shortest day of Tugui's shadow at noon is the summer solstice, and the longest day is the winter solstice, and the moderate shadow length is the vernal equinox or autumnal equinox. In the spring and autumn period, the book Shangshu recorded the solar terms. In Shang Dynasty, there were only four solar terms, but in Zhou Dynasty, there were eight solar terms.

The names of the twenty-four solar terms first appeared in Liu An's Huai Nan Zi Tian Xun in the Western Han Dynasty, and the concepts of Yin and Yang, four seasons, eight places, twelve degrees and twenty-four solar terms were also mentioned in the preface of Historical Records Taishigong.

Baidu Encyclopedia-24 solar term song