Square · 90° apart
Square
Same modality, clashing elements. Genuine friction, and genuine momentum: this pairing produces change, not comfort.
Fire · Cardinal · ruled by Mars
Brings. Starts things other people are still discussing. Recovers from setbacks faster than almost any other sign.
Struggles with. Bores quickly, interrupts constantly, and treats patience as a personal insult.
In love. Pursues openly and dislikes ambiguity. Wants a partner who can hold their own ground rather than yield.
Earth · Cardinal · ruled by Saturn
Brings. Plans in decades and executes without needing encouragement along the way.
Struggles with. Measures worth by achievement, and struggles to rest without guilt.
In love. Undemonstrative but dependable. Commitment is shown by showing up, not by saying so.
Aries is cardinal fire; Capricorn is cardinal earth. Sharing a modality means handling change the same way, which sounds helpful and often means competing for the same role.
Sun signs are one factor among many, and astrology itself treats them as a starting point rather than a verdict. Two full charts describe far more than two birthdays do.