Yang Gong’s Death Day” is also known as “Yang Gong’s Thirteen Taboos”. According to legend, it was established by Yang Junsong, a Feng Shui master in the Tang Dynasty. These thirteen “annihilation days” are respectively the 13th day of the first lunar month and the 2nd day of the 2nd lunar month. November, March 9th, April 7th, May 5th, June 3rd, July 1st, July 29th, August 27th, September 25th, October 23rd, November 21st and 10th February 19th.
"Yang Gong's Thirteen Taboos" have been valued by the Xuankong family since ancient times. In the eyes of the Xuankong family, these thirteen days must not be selected as the opening and the start of construction. , get married, sign contracts, etc.