Astrology basics
Moon sign vs Sun sign: what's the difference?
Your Sun sign is the zodiac sign the Sun was in when you were born — the identity you consciously build.
Your Moon sign is the zodiac position of the Moon at your birth, and it's traditionally read as your emotional inner life: what soothes you, what you need to feel safe, how you process grief and joy.
Two people born on the same day will share a Sun sign, but if they're born a few hours apart, they can have completely different Moon signs — which is why they can feel very different underneath.
The clearest way to read the pair: Sun = daylight self, Moon = evening self.