Astrology
The science of predicting attributes of someones personality and events in their life using the positions of the stars and planets in the sky the exact minute when they were born. A lot of people think astrology is fake, but with just their date and time of birth i could tell them the story of their life and describe their personality to a tee. So screw them.
That girl is a capricorn, so astrology shows that she is probably a very serious person.