Our grandparents seems to have magic powers sometimes. Give them a Chinese lunar calendar    1    they will know what the weather will be like days or even months later.

What's the secret? They are following the 24 Solar Terms (节气),     2    were added on Nov. 30 to the list of Intangible Cultural Heritage of Humanity (人类非物资文化遗产) by the United Nations (UN). It is a knowledge system and social practice    3    (form) through people's observations of the sun's annual movements and its influence on the climate.

The 24 Solar Terms    4    (come) into being during the Qin and Han    5     (dynasty). At that time, most Chinese people made their living on farms, so weather changes were    6    (extreme) important for them. But of course, they had no satellite, internet or weather broadcast    7    (help) them.    8    these difficulties, they managed to work out 24 Solar Terms by studying the sun's movement and also    9    (pay) attention to other natural changes such as air temperature, water and crop growth.

It is honored as China's    10    (five) great invention, after papermaking, printing, the compass and gunpowder. Now, it is still widely used in daily life even in the age of technology-based modern farming.