The twenty-four solar terms of the lunar calendar are the result of ancient China people's understanding of the seasons, () and the laws of phenological changes in a year.

The twenty-four solar terms of the lunar calendar are a complete knowledge system formed by ancient China people's understanding of the changing laws of seasons, climate and phenology in a year.

Solar terms refer to the twenty-four solar terms, which is a supplementary calendar formulated by China in ancient times to guide farming, and is the crystallization of the long-term experience and wisdom of the working people of the Chinese nation. Since China was an agricultural society in ancient times, agriculture needed to have a strict understanding of the operation of the sun, and farming was carried out entirely according to the sun. Therefore, the "twenty-four solar terms" that reflect the solar cycle alone are added to the calendar as the standard for determining leap months.

24 solar terms are: beginning of spring, Rainy, Scared, Equinox, Qingming, Grain Rain, Changxia and Xiaoman? , Miscanthus, Summer Solstice, Little Summer, Big Summer, beginning of autumn, Chushu, Millennium, Autumnal Equinox, Cold Dew, First Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.