Who knows what "Yang" means on this day?

"Yang Gong banned Japan", also known as "Thirteen Bannings in Yang Gong", was handed down by Yang Junsong, a geomantic master in the Tang Dynasty. These thirteen "taboo days" are 1 month 13, February 1 day, March 9, April 7, May 5, June 3, July1day, July 29, and July 29.

-"Thirteen Taboos of Yang Gong" has been valued by Xuankong scholars since ancient times. In the eyes of Xuan Kong's family, these thirteen days can never be chosen as opening, construction, marriage, signing contracts and so on.