Why do we have to worship God on the first and fifteenth day of junior high school?

From New Year's Eve to the 15th Party Congress.

The first day is early, the second day is early, and the third day is sleepy; On the fourth day, I was attached to God, on the fifth day, I was separated, and on the sixth day, I was fat. End on the seventh day and finish on the eighth day; On the ninth day of the ninth day, there is food on the tenth day; Eleven invited a son-in-law, twelve stopped a son to worship, thirteen ate black glutinous rice with mustard, fourteen tied a lantern shed, and fifteen went to the Yuan Dynasty.

From ancient times to the present, the custom of Chinese New Year has been constantly changing, which hides the beliefs and customs of the ancients and the pace of modern people advancing with the times. Whether you do it or not, believe it or not, you must see it clearly first.