The 13th day of the first month is "Yang Gong Day".
Yang Gongri is the anniversary of Yang Gong's death. Because Yang and Yang are homonyms, it is necessary to avoid being wrongly written as a day. According to the lunar calendar, it starts from the first 13 day of the first month, and every month is regarded as 30 days, with a Yang Gong Day every 28 days.
Also known as the Thirteen Taboos in Yang Gong, it was handed down from generation to generation 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 Kong's family, these thirteen days can never be chosen as opening, construction, marriage, signing contracts and so on.
Attachment: Legend of Yang Gongbi
Old customs and superstitions begin on the thirteenth day of the first lunar month, and then two days in advance every month will be Pepsi taboo day. Legend has it that it began in the Song Dynasty when Yang, a warlock, saved the poor, because he was called Yang Gongbi.
A long time ago, there was an old man named Yang. People call him Yang Gong. The young man has thirteen sons, and thirteen sons are like wolves and tigers, and they are rich. It can be said that some people need money and wealth. Yang Gong was born a little eccentric. One day, I was happy to say to a person there, "I haven't given birth to a son for a month, and I can still give birth to one for the New Year."
Immortals are everywhere, but mortals should not talk too crazy. A fairy passing by heard Yang Gong's crazy words. This god reported to the Jade Emperor, who was furious and ordered him to accept a son every month. Since the 13th day of the first month, Yang Gong's son has to leave once a month. Two days in advance every month, the thirteenth day of the first month, the eleventh day of February and the ninth day of March, are pushed down in turn. This year happens to be leap July, so Yang Gong's two sons were admitted in July. The dates are July 1st and 29th, so this year is thirteen months. Yang Gong's thirteen sons naturally have none. By the end of the year, naturally no one will spend the New Year with Yang Gong. Later, people called the day when their son died Yang. These days are very poisonous, so I can't go out. However, it doesn't matter if people go out every day now, but if you want to choose a day, you'd better not choose these days.