Old people say that the 19th day of the twelfth lunar month is taboo in Yang Gong. What is Yang Gong taboo?

"Yang Gong banned Japan", also known as "Thirteen Bannings in Yang Gong", was handed down by Yang Junsong, a geomantic master in 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 Kongjia, these thirteen days can never be chosen as the days of opening, construction, marriage and signing contracts.