Ruby's eyes widened but then she reminded herself that not everyone was a Divination geek.

"Oh, it has to do with astrology, Miss Lukeson. I am sure you are at least aware of your zodiac sign, which is determined by your time of birth? Well, that is just your sun sign. When someone is born, the planets upon the sky are in a certain positions, which could say a lot about what the person will be like and what is likely to occur in their lives. A birth chart shows a person's placements. As far as compatibility goes, an astrologer can tell a lot about whether a pair will be compatible based on certain aspects... Their venus sign and their moon sign and such."