Two planets form a square when they are spaced about 90° apart. The energies do not flow naturally into one another: it is a tension, an obstacle to overcome — but also a powerful driving force, one that pushes to develop, surpass oneself, and act.
A square is not a curse: it is a friction that pushes toward growth. Example: Sun square Saturn puts personal desire and a sense of responsibility in tension — it pushes to build solidly, but can create self-doubt that needs to be overcome.
Angle: 90°. Orb used on this site: 7°.
Nature: classified as tense, like the opposition and the two minor aspects that share the same geometric family (semi-square, sesquiquadrate — multiples of 45°). Three planets, two of which form a square to a third, make up a T-Square, a notable tension configuration.