Why hasn't there been beginning of spring for 24 years?

2024 is the beginning of spring, on February 4, 2024. Beginning of spring is the first of the 24 solar terms. Standing means "start"; Spring represents warmth and growth. Twenty-four solar terms were originally formulated on the basis of "variable stars". When the bucket handle of the Big Dipper points to the shade, it is beginning of spring.

At present, solar terms are determined according to the longitude of the sun. When the sun reaches the longitude of 3 15 degrees, it is beginning of spring, which is celebrated on February 3-5 of the Gregorian calendar every year.