Why are the stars in every palace in Wei Zidou divided into three colors?

Every family in Weizimen uses three colors to distinguish the stars of Grade A, Grade B and Grade C. Each color represents different grades of stars, among which Grade A has the greatest influence, while Grade B and Grade C are weaker. Class A is also the fourteen main stars under Wei Zimen, and they play a decisive role. Class B is mainly some influential auxiliary stars and malefic stars, while class C is even weaker.

For example, the astrolabe discharged from Yuan Hengzhen's website above, the scarlet letter is an A-level star, which is one of the 14 main stars of Dou, and has the greatest influence. Pink characters are B-class stars, auxiliary stars and malefic stars, Wen Qu and Youbi are auxiliary stars, brown characters are C-class stars, and Tianyue, Longchi and Tiangui are lower-level auxiliary stars.