Square (90°)
Orb: 8°
Right-angle friction — the hardest aspect to live with and the most character-forging.
Geometry
90° between planets, in incompatible signs (modes match — both cardinal, both fixed, both mutable — but elements clash).
What it does
Squares produce friction. The two planets want different things and neither will yield. That is exactly why squares build something: the friction is the engine. The natives who do the work on their squares develop deep skill in those planet's domains.
Example in a chart
Mars square Saturn: drive versus discipline, ambition versus caution. Early life feels like braking with the engine running. Later life: rare endurance and the kind of work ethic that compounds.
When it forms in the current sky
Saturn square natal Sun transits (around age 7, 14, 21, 29, 36...) are the classic life-restructuring moments — the friction forces a decision.
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