Why are the 24 solar terms so accurate?

Twenty-four solar terms are very accurate, because "Twenty-four solar terms" are the product of ancient farming civilization and a knowledge system formed by ancient ancestors following the farming season, observing the movement of celestial bodies and understanding the changing laws of seasons, climate and phenology. One year, mainly due to scientific progress, is very accurate.

The twenty-four solar terms were originally formulated according to the changes of stars. The Big Dipper rotates circularly and bucket handle rotates clockwise, which is called one of the "years". The current "twenty-four solar terms" are formulated according to the position of the sun on the return to the ecliptic, that is, the annual movement track of the sun is divided into 24 equal parts, each 15 is 1 equal part, and each 1 equal part is a solar term, starting from beginning of spring and ending from the severe cold.