Why isn't the Sun sign enough?
The question 'what's your sign?' covers a single point in your birth chart: where the Sun stood at the moment you were born. That says a lot about your identity and core motivation, and rather little about everyday life as a couple. The Moon shows what you need in order to feel safe and how you react under tension. Venus shows how you express affection and what you count as love; Mars covers desire and how you handle conflict; the ascendant describes how you present yourself in the first few weeks. Two Sun signs that look compatible on paper can still talk past each other if their Moons work in completely different ways.



