Twenty-four solar terms take the earth's revolution around the sun () as a cycle? a.2 b.3 c. 1.5 d. 1

Twenty-four solar terms take the earth's revolution around the sun 1 week as a cycle.

The sun revolves once a year, and the 24 solar terms are also a reincarnation every year. Twenty-four solar terms are special festivals in the calendar to express the change of natural rhythm and establish "December architecture", which contains a long cultural connotation and historical accumulation and is an important part of the long history and culture of the Chinese nation. Four years old, three months in spring, summer, autumn and winter, two solar terms each month, each solar term has its own unique meaning.

Twenty-four solar terms accurately reflect the change of natural rhythm and play an extremely important role in people's daily life. It is not only a seasonal system that guides agricultural production, but also a folk system that contains rich folk customs.

"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 return to the ecliptic, that is, the annual movement track of the sun is divided into 24 equal parts, each 15 is 1, and each 1 is a solar term, starting in beginning of spring and ending in severe cold.

Through historical development, the lunar calendar absorbed the solar terms of the dry calendar as a supplement to the calendar, and adjusted it to conform to the tropic year through the leap method, forming a combined calendar of yin and yang, and the "twenty-four solar terms" became an important part of the lunar calendar. In the field of international meteorology, the 24 solar terms are known as "the fifth invention of China". 2016165438+1October 30th, the 24 solar terms were officially listed in the representative list of UNESCO and human intangible cultural heritage.

Folk customs about the 24 solar terms

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". The combination of "Li Si" and "one divides into two" is called "Eight Sections", and the folk call it "Eight Sections in Four Seasons". 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 sacrifices to the gods and ancestors, exorcising evil spirits, praying for blessings and welcoming the new are arranged in 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.