The angle between your signs — the square (90°)
The square is the aspect of tension: you want the same thing at the same time, just not the same way. This bond never falls asleep. It asks you to pick your battles, and makes you both stronger when it holds.
Your elements — Fire and Earth
Fire wants to go, Earth wants to build. One brings the momentum, the other the shape — provided the first agrees to wait and the second agrees to move.
Your rhythms — cardinal and cardinal
Two cardinal signs: you both start things. Plenty of initiative — and the question of who leads.
Your rulers
Aries is ruled by Mars, Capricorn by Saturn. Drive and fight, facing structure and time.