What does it mean to avoid the sun?

Thirteen taboos in folk calendars (you wouldn't believe it without scientific basis).

Thirteen bogeys are thirteen bad days set by Yang Junsong for quietness and immobility. These thirteen days can't be chosen as opening a business, breaking ground, decorating a house, getting married, moving into a house, entering a job, traveling, giving birth to a baby, burying a grave, signing a contract and so on.

This taboo legend was adapted from a fairy tale and then compiled into a yellow calendar, indicating the daily taboos of ancient people.

Legend related to extended data:

An old man surnamed Yang has thirteen sons, all of whom are as rich as wolves. It can be said that some people need money, and Yang Gong is naturally a bit erratic.

One day, he was very happy when talking to someone, and boasted, "I just haven't had a son for a month, and I can still have one for the New Year."

Who would have thought that Yang Laotou's wild words were heard by passing immortals and reported to the sky. The jade emperor was so angry that he ordered to accept a son every month. Since the 13th day of the first month, Yang Gong's son has to walk once a month, and he has to walk for two days every month. On the thirteenth day of the first month, the eleventh day of February and the ninth day of March, push it down in turn.

What's more, this year happens to be leap July. Therefore, Yang Gong's two sons were accepted in July, which were July 1 day and July 29th. So this year is thirteen months, and none of Yang Gong's thirteen sons are left. 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, thinking that these days were too poisonous, and they should try to avoid going out to do things.