Inquire about the relationship between stars and stars on duty

Inquiries about the relationship between stars on duty:

The method of keeping a diary in turn at twenty-eight nights is that one night represents one day, and twenty-eight nights represents twenty-eight, and so on. The 28th is a cycle, which happens to take turns around. So, according to the rhyme below, you can check whether the twenty-eight nights printed on the almanac are correct, just look at the day of the week on that star (the corresponding relationship will never change).

Stars are astronomical terms.

It refers to the place where the sun, the moon and five stars live. A night usually contains one or more stars. The ancients divided the vicinity of the ecliptic into twenty-eight groups, commonly known as "twenty-eight lodges". Because the rings of twenty-eight hostels are arranged in four directions of the sun, the moon and the five stars, which are very similar to the places where the sun, the moon and the five stars live, they are called "hostels".

The starry sky is divided into seven nights according to the four directions of southeast and northwest, namely "four elephants": black dragon in the east, suzaku in the south, white tiger in the west and Xuanwu in the north. "Three Auxiliary Huang Tu" Volume III: "Black Dragon, White Tiger, Suzaku, Xuanwu and Tiansi Spirit are all square."