In order to facilitate research and observation, the first step is to name the stars. It has specific naming rules. The internationally accepted star naming method is to name all the stars in each constellation in order from brightest to darkest, and then add the constellation name before the Greek letters, such as, and. Before the 11th century AD, the starry sky was divided into many "stars". The meaning of the stars is similar to that of the constellations. Then name them such as Vega, Canopus, Sirius, etc. These names have always been used in the astronomical community.