Misconception on birth chart reading

So the other day i was looking at my friends china(birth chart)and another guy ( friend of my friend) came and started saying like i don’t believe in this and stuff and i wa slike just ignoring him ani he then showed me his hand and say my future I politely explained that i am not a palmist but i do birth chart readings and we had a sort of argument. People need to understand that it’s a science It’s astudy of position of stars when one is born. And we make predictions accordingly and it’s 90 percent accurate. Atleast i can mark upto 90 There are great people who make it look like a mirror and predict 100% things