Mutual respect, if slowly
Both signs are starters and both are driven, and that’s the shared ground. Capricorn watches an Aries walk straight up to someone important and ask for what they want, and quietly wishes they could do that. Aries watches a Capricorn spend three years building something solid, and is more impressed than they’d admit. Often this pairing begins at work, or with one person noticing the other is very good at something.
Capricorn has a dry, late-arriving sense of humor that Aries tends to love once they find it. Aries can coax a Capricorn out of the office and into a Saturday that has no purpose at all, and that’s no small thing.
Who’s in charge of the plan
The square between them is about authority and pace. Capricorn plans, saves and has views on how things should be done. Aries hears that as being told what to do, which is about the only instruction they reliably ignore. Aries’ impulse buy can undo a month of Capricorn’s budgeting. Capricorn’s “let’s wait and see” can feel to Aries like being kept on a lead.
There’s also an affection gap. Capricorn tends to show love through effort: working late to provide, fixing the boiler, showing up. Aries wants to hear it, and wants a little fuss. Each can feel unappreciated while working quite hard for the other.
Dividing up the future
Have one shared long plan that Capricorn gets to steer, and one pot of money or time Aries can spend with no questions asked. Capricorn can say the kind thing out loud, even when it feels unnecessary. Aries can notice what’s being done for them, and say thanks in a way that doesn’t sound like an afterthought.
Since this comes down to work and warmth, a look at how Saturn squares Mars in other couples is useful, and whether your charts have that contact matters far more than these Sun signs do.