"July filariasis" refers to the movement of the stars in July in the summer calendar, not to the hot weather. It was first published in China's earliest book (

Fire in July, from The Book of Songs in July, is said to be the oldest and most detailed long poem describing the hard life of slaves in the Western Zhou Dynasty. The first sentence of the original poem goes like this: "July is a fire, and clothes are given in September." On the first day, it will be fierce the next day. No clothes, no brown, why did you die? On the third and fourth day, I stood on tiptoe. I am very happy to be in the south with my daughter-in-law. " If translated into modern Chinese, it means: "Mars flows west in July, and women make cold clothes in September. The cold wind is howling in winter,1February. How can we spend this winter without brown short thick clothes? Repair farm tools in the first month and raise fields in February. My wife took the children and sent me meals to the fields. Tianguan is naturally happy. "

Here, "July Fire" is an astronomical phenomenon. It means that every year in the autumn of July in the lunar calendar, not in the summer of July in the solar calendar, the star named "fire" in the sky will flow westward, and it will be cold in summer.

"July filariasis" is often misused as a sentence to describe the heat. It is a very vivid and romantic usage, which is actually a misunderstanding and misuse of ancient poetry.

The Book of Songs is the earliest collection of poems in China. The pre-Qin period was called "The Book of Songs", also known as "Three Hundred Poems" or "Three Hundred Poems". It collected about 305 poems from the early years of the Western Zhou Dynasty to the middle of the Spring and Autumn Period. In the Western Han Dynasty, it was honored as a Confucian classic, formerly known as The Book of Songs, which has been in use ever since. Music is divided into three parts: wind, elegance and ode. Among them, Wind is a local folk song with 15 national styles and 160 songs. "Elegance" is mainly court music songs, divided into elegance and vulgarity, 105; Ode is mainly ancestral temple music songs, with 40 songs. The main methods of expression are fu, bi and xing. "Fu" means paving the way, "Bi" means figuratively, and "Xing" means saying something else first to cause the words to be sung. Folk songs have the highest ideological value and artistic value in The Book of Songs. "Hungry people sing about their food, and laborers sing about their affairs." Vatan, Storytelling and Mang are Feng's representative works. The Book of Songs has a far-reaching influence on the development of poetry in later generations, and has become the source of the realistic tradition of China's classical literature. The Book of Songs handed down in the world is a collection of poems handed down by Mao Heng and Scapharca subcrenata.