What is the use of constellation blood type? Today, a girl asked me about my horoscope and blood type.

Blood type is innate and cannot be changed. It is determined by genes and has scientific basis. Constellation is man-made and a noun defined for entertainment. There is nothing between them. There is no basis for the usual blood type to determine personality type. Personality is mainly determined by environment and acquired growth experience. Most constellations will match their own personality, but they can't completely correspond. This is because people are smart in induction, and no one can completely determine a person's character through a certain point. So these are just entertainment, and that girl is probably just studying you, so don't care! Have fun!