What's the point of celebrating Memorial Day?

In the old funeral custom, the filial son didn't entertain guests, drink, entertain, go to other people's homes, shave his head, even bathe or change clothes for a hundred days, which was called "one hundred days of mourning".

The activity of offering sacrifices to the sun has a long history, which originated from the worship of the sun god by the ancestors of Huaxia.

Xia, Shang and Zhou dynasties all have the tradition of offering sacrifices to the sun. It is still dark every day in summer, and the memorial day is after sunset; Yin Shangbai, chosen at the top of the red sun; Zhou Shangchi is used to offering sacrifices to the sun in the morning and evening when the sun is red. But in the Zhou dynasty, "heaven" was the highest god, and the taste of the sun god declined. He only offered sacrifices in beginning of spring, Spring Equinox, Long Summer, Summer Solstice, beginning of autumn, Autumn Equinox, beginning of winter and Winter Solstice. Especially in the days of beginning of spring, Changxia, beginning of autumn and beginning of winter, the Emperor of Heaven personally led three princes, nine ministers, governors and doctors to worship the sun in the suburbs, and the ceremony was grand. In the event of a solar eclipse, the official entertained the miser who beat the drums and galloped to get coins as a gift to the gods. Shu Ren rushed to save the solar eclipse, and rushed to save the day. This ritual still existed in some areas before liberation.

Another explanation for Memorial Day is "sacrifice or memorial day". For example, people used to call Tomb-Sweeping Day "Memorial Day". [2]? People usually say that the day to commemorate someone's death should be "death anniversary", also known as "death anniversary"

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