By observing the sky, the ancient Chinese divided the sun’s annual motion     1     24 equal sectors, with each     2     (be) the basis for one solar term. The 24 Solar Terms(节气) start from the Beginning of Spring and end with the Severe Cold.

As early as the Shang Dynasty, our ancestors set the first four major solar terms,     3     marked the four seasons. Later they evolved into eight. It was not until the Western Han Dynasty     4     the present 24 Solar Terms were     5     (complete) established and officially adopted by the government.

The     6     (long) of the 24 Solar Terms was based on the movement of the sun, and    7     (they) names were chosen according to the changes in temperature, climate and other aspects of human life. They remain serving as an instruction for farmers,     8     (guide) their agricultural practices during certain periods of the year. Common people follow the calendar to watch for weather changes and live     9     healthy life.

Each lunar month contains two solar terms, and each solar term has some to-do customs. In 2016, the Twenty-Four Solar Terms     10     (include) on UNESCO’s Representative List of the Intangible Cultural Heritage of Humanity.