I quite frequently looked up numerology in recent months to determine compatibility between me and a girl I was friends and playmates with as a child, who I know indirectly, but live far away from, and to gain insight into my personality, and hers while she's away. I also used it to determine what careers I should look into. I heard this is shirk, but how is using numerology (the mystical study of numbers) to gain insight into personality shirk, when personality is not the unseen, but rather, something which can be studied and concerns wordly things? I can understand it being shirk for predicting the future, but i dont do that. also, my father, who i look up to, says it isn't shirk, but he believes more in astrology than numerology. I looked up numerology as recently as this morning. I'm really scared that it invalidates my prayer for 40 days and is a sin though, because I prayed a lot in tahajjud prayers this ramamdan, praying for justice for peoples around the world in such places as turkey, syria, iraq, burma, kashmir, east turkestan (xinjiang province of china), russia, venezuela, and for me to become successful and make a smooth transition into adulthood (Im 18, and heading off to college soon), and id hate for all that prayer to go to waste.