The date of Xiao Man is generally May 20th or 2 1, and the date of Da Man is generally June 5th. The time difference between Xiaoman and Daman is about 16 days, which is determined by the change of the position where the sun shines directly on the earth. Therefore, after Xiaoman, there will be no Daman, but it will pass through solar terms such as awn seed and summer solstice, and it will reach Daman on June 5 and 6.

Xiaoman and Daman are one of the important solar terms in the traditional 24 solar terms in China. Xiaoman is the solar term before the summer solstice, while Daman is the solar term after the summer solstice. This time difference is determined by the laws of the earth's rotation and revolution, and reflects the changes and laws of natural phenomena, which is of great significance in China's traditional culture.

Brief introduction of 24 solar terms

Twenty-four solar terms scientifically reveal the laws of astronomical and meteorological changes, skillfully combine astronomy, natural rhythm and folk customs, and derive a large number of related seasonal cultures, which have become an important part of China traditional culture. In order to express the characteristics of time series more accurately, the ancients divided solar terms into four groups according to climate and phenology: minute, arrival, start and close.

The vernal equinox and autumn equinox were called dichotomy in ancient times. Solstice is the summer solstice and the winter solstice, which was called the second solstice in ancient times. Beginning of spring and Changsha are open, and beginning of autumn and beginning of winter are closed. Beginning of spring, Changsha, beginning of autumn and beginning of winter, collectively known as Li Si, add up to eight sections. Folk call it four seasons and eight festivals. In the long farming society, the 24 solar terms have played an important guiding role in farming activities and have rich cultural connotations.

The above contents refer to Baidu Encyclopedia-24 solar terms table.