Which dynasty did someone calculate the 20 solar terms in the lunar calendar?

It is not a person who has the final say, but the result of long-term practice. In the Spring and Autumn Period, there were the concepts of Solstice and Solstice. By the end of the Warring States Period, solar terms had eight names: beginning of spring, Equinox, Long Summer, Summer Solstice, beginning of autumn, Equinox, beginning of winter and Winter Solstice. These eight solar terms are the most important of the 24 solar terms. Mark the seasonal changes and clearly divide the four seasons of the year.

Written in the second year of Emperor Jianyuan of the Han Dynasty (BC 139), Liu An, the king of Huainan, and Su Fei, Li Shang, Zuo Wu, Tian You, Baylor, Mao Bei, Wu Bei, Jinchang, etc. * * *, the names of the 24 solar terms are exactly the same as those of modern times.

In BC 104, the calendar compiled by Heluo officially set 24 solar terms in the calendar and determined the astronomical position of the 24 solar terms.