I love this subject. I think that people give zodiac signs a bad rep because of the ~future divination~ aspect that attracts so many people.
Really, the main hypothesis of astrology is that things are a certain way depending on where they are in the never-ending cycle of the universe. The way we determine where we are in the cycle is by studying the sky and making a stellar map that shows exactly where we stand in terms of space and time.
To illustrate, it was a common practice in ancient architecture to include a map of the sky on the day in which they concluded the structure. Because then, even if aliens come to Earth and find this structure, they would be able to pinpoint exactly when and where that map was made.
This is a solid gold Peruvian star map.
Though I don't believe that we can tell how the personality of the person is going to be exactly like based on what phase of the cycle the person was born, I do think that there's a significant difference between someone who was born in summer vs someone born in winter.
Not to mention the kids who were born too early in the ear and were basically one year ahead in school and sports teams.
If you believe that things are different depending on what stage they are in the cycle of the cosmos, then you believe in astrology.
I'm a Leo and I like LSD.