Square · 90° apart
Square
Same modality, clashing elements. Genuine friction, and genuine momentum: this pairing produces change, not comfort.
Water · Fixed · ruled by Pluto (traditionally Mars)
Brings. Sees through pretence instantly and commits completely once convinced.
Struggles with. Tests people rather than asking, and remembers slights for a very long time.
In love. Intense and private. Wants total honesty and gives it slowly.
Air · Fixed · ruled by Uranus (traditionally Saturn)
Brings. Thinks for itself and cares about fairness at a scale beyond its own circle.
Struggles with. Intellectualises feeling, and mistakes emotional distance for objectivity.
In love. Values friendship inside a relationship above romance. Needs autonomy preserved.
Scorpio is fixed water; Aquarius is fixed air. 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.