What do you mean by "three Daan"?

The third, fourteenth and twenty-fifth days of the lunar month. "Three Great Ans" refer to the third, fourteenth and 25th day of the lunar calendar, because these days are Da 'an Day, that is, the time before and after the "Da 'an" solar term in the twenty-four solar terms of the lunar calendar. In the traditional culture of China, "Da 'an" is regarded as auspicious, which will bring people the meaning of peace, stability and well-being. Therefore, it will be more auspicious to hold sacrificial activities in these three days.