The following statement about the twenty-four solar terms is correct ().

Analysis of "Twenty-four solar terms" is an important intangible cultural heritage in China, which is a calendar mainly used to guide agriculture according to the different periods of the earth's orbit around the sun. Error a is made according to the position change of the earth on the ecliptic plane. Item b is correct. It is formulated according to the growth and phenological changes of crops and is a supplementary calendar to guide agriculture. In mistake c, the word "spring" means "the beginning of spring" and "standing" means the beginning of the season. In mistake d, dew is water, which is frosted first and then frozen, so cold dew comes first.