Witty words; Punchline
Song of stepping into the sky is an astronomical work that introduces the names, numbers and positions of stars in the whole sky in the form of poetry. Legend has it that it was written by Wang Ximing in the Tang Dynasty, and it was named Dan Zi Yuan, so it was also called "Song of Dan Zi Yuan Ascending to Heaven".
Classical explanation
The poem in this book rhymes with seven words and one sentence, and describes 283 stars *** 1464 compiled by Chen Zhuo, the Soochow Taishi, according to the astrological classics of Shi, Gan and Wu during the Three Kingdoms period. In the history of astronomy in China, Song of the Sky pioneered the method of dividing the starry sky into three walls and twenty-eight nights, that is, the stars near the North Pole are divided into three walls: Wei Zi, Qiu and Shi Tian, and the rest belong to twenty-eight nights. The whole sky is divided into thirty-one regions. This zoning method makes each area have an appropriate range of topics. It is precisely because this method of dividing the starry sky is reasonable and very vivid that it has been used until modern times.
Song of the sky is a must-read book for ancient people to learn astronomy, because the stars in the sky are easy to identify and remember. In the book Lingtai Secret Garden, which was rebuilt in Song Dynasty, Song of Treading in the Sky was matched with a star map to make its starry sky scene clearer.