It means comet in ancient books. Purple, first, refers to a purple comet, or a bright comet.
It is mentioned in the twelve volumes of Tai Shang San Kong Mantra.
Zi eryi, four tassels, nine days yuan, four days crystal essence. Encircle the mysterious spirit inside and guard the handsome soldiers outside. Right Town, Zuo Wei, the sign of wind cutting fire. Kill all demons and destroy thousands of spirits. Since Jin Zhen started town, evil spirits have disappeared.
Duke Zhou: The meteor never leaves the main migration.
A piece of paper says "Ziyan", which means that the meteor will not fall. Is it possible for you to move to central China? -For reference.