Lonely stars accompany the moon every few years.

Thirty years. Lonely star accompanying the moon is a common celestial movement phenomenon, which is limited by time like other celestial phenomena. This phenomenon occurs every 30 years. Lonely stars accompanying the moon is an astronomical phenomenon. On the fifteenth night of the first month, the moon is located in Leo, and it passes only 3 degrees (angular distance) north of the brightest star "Xuanyuan XIV" in Leo. The star of "Xuanyuan XIV" is a first-class star, which people can see with the naked eye. This astronomical phenomenon is called "lone star accompanying the moon".