Why do girls always care about constellations?

Because girls are very emotional and believe in the so-called fate. Therefore, it is very romantic to think that the stars in the sky can influence the character of the wide world and the communication between people. Moreover, through the rough classification of each constellation, it seems that one can predict one's temperament and hobbies, so girls will be interested in it.

In fact, the constellation is not as simple as you said, "everyone in the same constellation has the same personality characteristics." You must have only a superficial understanding of the constellations. You probably only know that there are 12 constellations, but you don't know much about them. In fact, in addition to the sun sign (usually divided by month), everyone has another moon sign, such as gold, wood, water, fire and earth, which is divided more finely according to the time of birth. For example, if a person was born in mid-July, his sun sign is a lion, the moon sign may be an Aquarius, Venus is a Capricorn, and so on. In this way, the broad classification of the 12 constellation you mentioned has a more detailed classification. Even people born in the same month will be influenced by different constellations because of the different specific date and time of birth.