From which solar term did twelve of the twenty-four solar terms start to be selected?

Twenty-four solar terms are a general term, including twelve neutral terms and twelve solar terms, which are arranged alternately.

Among the 24 solar terms, 12 solar terms are selected from the vernal equinox. Starting from the vernal equinox, the twelve middle qi are vernal equinox, Grain Rain, Xiaoman, summer solstice, big tree, early tree, autumn equinox, early frost, light snow, winter solstice, severe cold and rain, which belong to the twelve months of earthly branch arrangement. 12 of the 24 solar terms were selected from beginning of spring. The twelve solar terms since Qingming are Qingming, Jing Zhe, Chang Xia, Mang Zi, Xiao Shu, beginning of autumn, Bailu, Cold Dew, beginning of winter, Heavy Snow and Slight Cold.