17, 27, 37, 47, 57. What do you mean?

The first seven refers to the seventh day after death.

Sanqi refers to the fifteenth day after death.

May 7th refers to the 35th day after death.

July 7th refers to the 49th day after death.

According to tradition, the memorial ceremony after death is very particular. People think that people don't know that they are dead until seven days after death, so they should hold "line seven" From the date of the death of the deceased, every seven days is a memorial day, which is called the first seven days, the last seven days, the third seven days, the fourth seven days, the fifth seven days, the sixth seven days and the last seven days, with a total of 49 days. This is mainly influenced by Buddhism and Taoism.

Extended data:

According to folklore, people have three souls and seven spirits. After their death, they lost one soul a year, one spirit for seven days, and seven full spirits in three years, so they have to go through the "seven periods" and the third anniversary. There is another folk saying. It is said that from the date of death, the deceased will be interrogated every seven days for 49 days, so the "seven periods" are also called "seven disasters".

At seven o'clock, mourners should hang white lanterns at the gate to show filial piety. The first seven people set up a memorial at home, burning incense and lighting candles for wine and food as a souvenir, and the remaining six or seven people went to the cemetery to spend paper money. Generally, the ceremony of the third day and the fifth day is grand, relatives and friends are there, and the dutiful son wants to cry without tears; Two, four, six and other double sevens, relatives and friends don't come. The dutiful son only burns paper and doesn't cry, which is called "empty seven"