What was the first solar term created in 24 solar terms?

The winter solstice is the first of the 24 solar terms. More than 3000 years ago, the Central Plains used the method of returning to the earth to measure shadows, and its position in the world was measured in Luoyi, Henan. As a soil, the "winter solstice" established by the standard table is the first measured among the 24 solar terms of Duke Zhou, and the winter solstice is regarded as the first of the 24 solar terms. The Book of History in the Spring and Autumn Period recorded the solar terms. There were only four solar terms in the Shang dynasty, but in the Zhou dynasty, it developed to eight. The current 24 solar terms come from the method of dividing the longitude of the sun more than 300 years ago, which is still in use today.