Sure it does. I've met people who will say things like "My sun sign is Virgo, but my personality is dominated by my Sagittarius moon", and then later say something like "I'm going through Saturn return, no wonder Pisces is such an influence".

If you compare someone's self-view ("I'm an Aries!") with their behavior (definitely a Gemini), you can draw conclusions. It's standard practice in astrology.