The statement about the twenty-four solar terms is correct: ()

Since 2000, the main political activity center in China has been concentrated in the Yellow River Basin [1], and the 24 solar terms have been established according to the climate and phenology in this area. Therefore, item D is wrong.

The twenty-four solar terms are divided according to the position of the sun on the ecliptic (that is, the orbit of the earth around the sun). The date of solar terms is relatively fixed. So, A is wrong.

B correct

Summer solstice-indicates the extreme of summer in astronomy, not the starting point (long summer is). So, C is wrong.