What do you mean by bright three-day delivery?

Dog days, also known as the third day of the sun and moon, refer to the moon phase on the fifteenth day of the first lunar month, that is, the third day after the full moon. According to relevant data, giving light on three days is one of the important solar terms of the Lantern Festival, which means that the moon in the sky becomes particularly bright and brings new hopes and blessings. In the folk, people will set off fireworks and release Kongming lanterns on the third day to show their celebration and blessing.