What about being on duty for 28 nights? Who are the stars today?

Twenty-eight-night duty is an ancient and mysterious cultural heritage, and the calculation methods are mainly divided into two methods: degree method and digit method.

1. Degree method: According to the standard that the solar declination is equal to 23.5 degrees, the sum of solar declination every day in a year is 23.5, and the initial star with the closest value among 28 stars is the value star of that day. This method requires high computation and is suitable for astrology professionals.

2. Counting method: Counting every day from beginning of spring. When 10 and 20 are encountered, ten digits are removed, leaving only one digit. But when there is 30, it will be treated as 2, and the number obtained is the number of days on duty that day. This number corresponds to 28 stars in turn, that is, the number 1 corresponds to the eastern star, the number 2 corresponds to Nankang star, and so on.

Today is Wu Jiayue's ugly day, and the stars are worth the night.