In the fifth month of the lunar calendar 13, it is said that Master Guan sharpened his knife and it will rain. Any allusions? Why is the fifth lunar month 13?

Legend 1: In ancient times, there was a basilisk in the South China Sea. This is the third prince of the Dragon King. He once controlled rain from a distance and endangered the world. It was the 13th day of the fifth lunar month, and the land was cracked. The Jade Emperor sent Guan Yunchang to find the basilisk that day, but the basilisk abused Guan Gong for meddling. Guan Yu was furious and said, "I thought it would be as easy as blowing off dust to get six generals through five customs." Now, what are the difficulties? " It's just that my nod has rusted, because I haven't eaten raw meat for a long time. I'll grind it again and take your demon head off! "So he put the120kg long-handled meniscus broadsword on the big stone at the mouth of the cave and ground it. The basilisk was frightened and surrendered, and the world was at peace from then on. Therefore, every year on the 13th day of the fifth lunar month, people in Kunlun Pass will hold a ceremony to thank Guan Gong for his kindness.

Legend 2: May 13th of the lunar calendar is Guan Gong's birthday, and it rained a lot that day. Legend has it that it was used to sharpen Guan Gong's knife.