What does it mean to sing the song "Step by Step in the Corner"

Jiaosu, meaning Dragon Horn, is one of the seven places in East Qinglong. Song of stepping into the air is a seven-character poem. It introduces the name, number and position of each star official. Song of the Sky, written by Dan Zi Yuan in Sui Dynasty, is the first time to sort out and record all the members of San Yuan 28 Su in detail, and its chapter, star official, asterisk and star-seeking order strictly follow the actual observation results. Its language is rigorous, accurate and easy to understand, and it is an important masterpiece to express Chinese astrology. Each night among the 28 stars has its own specific meaning. The horn of the East Qinglong for seven nights means the horn of the dragon.