The following solar terms in chronological order is correct (). A. Slight heat, great heat, intense heat, beginning of autumn B. White dew, autumnal equinox,

The following solar terms are arranged correctly in chronological order: white dew, autumnal equinox, cold dew and first frost.

The time sequence of the twenty-four solar terms is beginning of spring, rain, sting, vernal equinox, Qingming, Grain Rain, Changxia, Xiaoman, Busy, Summer Solstice, Slight Summer, beginning of autumn, Early Summer, Millennium, Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.

"Twenty-four solar terms" is the product of ancient farming civilization. It is a knowledge system formed by ancient ancestors following the farming season and observing the movement of celestial bodies to understand the changing laws of seasons, climate and phenology in a year. The twenty-four solar terms were originally formulated according to the changes of stars. The Big Dipper rotates once and bucket handle rotates once clockwise, which is called one of the "years" (Figure).

The current "twenty-four solar terms" are formulated according to the position of the sun on the ecliptic, that is, the sun's trajectory in one year is divided into 24 equal parts, each 15 is 1, and each 1 is a solar term. Four years old, three months in spring, summer, autumn and winter, two solar terms each month, each solar term has its own unique meaning.

folk custom

Twenty-four solar terms scientifically reveal the laws of astronomical and meteorological changes, skillfully combine astronomy, agriculture, phenology 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: divided, arrived, opened and closed.

"Minute" refers to the vernal equinox and the autumn equinox; "Solstice" is the summer solstice and the winter solstice; "Open" is beginning of spring and Changxia, "closed" is beginning of autumn and beginning of winter. Beginning of spring, Chang Xia, beginning of autumn and beginning of winter are collectively called "Sili". "Li Si" and "divided into two" are collectively called "eight festivals", and the folks call them "four seasons and eight festivals".

As a traditional agricultural society, the ancients attached great importance to the beginning of the Lunar New Year and held various folk activities during this period. In ancient times, the importance of etiquette and customs was not the first month of the lunar calendar, but beginning of spring Day; Major activities, such as worshipping God and ancestors, exorcising evil spirits and eliminating disasters, praying for New Year's blessings and welcoming the New Year, will be held at the beginning of spring and a few days before and after.

This series of festival activities not only constitutes the framework of the New Year's Eve Festival in later generations, but also retains its folk function to this day. According to the law of solar terms, beginning of spring is the beginning of the rising of yang in the qi of yin and yang. Since beginning of spring, the yang has changed and risen, and beginning of spring marks the rebirth of everything and the beginning of a new cycle.

The solstice in winter is the starting point for the return of the sun. Since the winter solstice, the height of the sun has risen, and the day is getting longer and longer. The winter solstice marks the rebirth of the sun and the round-trip movement of the sun into a new cycle. In the "four seasons and eight festivals", the solstice in winter is as important as New Year's Day in spring.

In the long farming society, the 24 solar terms play an important role and have rich cultural connotations. Some solar terms, such as beginning of spring, Winter Solstice and Tomb-Sweeping Day, are both natural solar terms and important folk festivals. Other solar terms have also spawned a large number of related folk culture.