Libra on the inside, Capricorn on the way in.
Your sun in Libra (air, cardinal) is the engine — what thinks at the centre, what starts when you are at home in yourself. Your Capricorn rising (earth, cardinal, ruled by Saturn) is the door — the way you arrive in a room, the first read the world takes of you, the body you walk in.
Strangers tend to assume you are steady and grounded — that is the Capricorn arriving first. Then they get to know you and discover the Libra air underneath, which can be a quiet contrast — grounded surface, mobile core.
Reads as Capricorn until you trust them; then Libra comes through. The cardinal-cardinal mix means you consistently starts.