Is the solar term a festival?

Yes, twenty-four solar terms are also called twenty-four solar terms?

The 24 solar terms are: beginning of spring, Rain, Sting, Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoxia, Daxia, beginning of autumn, Early Summer, Bailu, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold. Beginning of spring, Jingzhe, Qingming, Changxia, Mangzhong, Xiaoshu, beginning of autumn, Bailu, Hanlu, beginning of winter, heavy snow and slight cold in solar terms.

They are the beginning of silver moon, Uzuki, Chen Yue, Mitsuki, wuyue, Yue Wei, Shen Yue, Moon, Years, Sea Moon, Zi Moon and Ugly Moon. In the historical development, the 24 solar terms have been incorporated into the lunar calendar and become an important part of the lunar calendar.

Extended data:

In ancient times, solar terms were determined by the direction of the top of the bucket handle of the Big Dipper, which rotated circularly and was closely related to the 24 solar terms. Polaris is located at the northern end of the earth's axis, which is five times as long as the extension line connecting Tian Xuan and Shu Tian in the Big Dipper.

Because of the earth's rotation, Polaris is just on the axis of celestial rotation, so it is relatively static, while the Big Dipper on the axis seems to revolve around Polaris, resulting in a "star shift".

In ancient astronomy, bucket handle and the Big Dipper were called "swords". Turn the handle of the bucket once and call it one year old. The word "sui" is also called "country" and "tai sui", which is the star name of that era in ancient times. The ancients used "year old" to indicate the alternation of cold and summer, and the Book of Changes: cold and summer pushed to form the year old.