One and a Half Squares
The sesquisquare (sesquiquadrate) is 135° one square (90°) plus one semisquare (45°). Like the semisquare, it is a minor hard aspect of the 8th harmonic family. Its effect is similar to the semisquare: persistent low-grade friction and agitation, rather than the crisis-triggering intensity of the full square. Most astrologers allow a 2–3° orb. The sesquisquare often describes recurring friction or agitation that erupts in specific circumstances.
Sesquisquare vs Square
| Aspect | Angle | Intensity | Typical Orb |
|---|---|---|---|
| Square | 90° | High crisis and friction | 6–8° |
| Sesquisquare | 135° | Medium persistent irritation | 2–3° |
| Semisquare | 45° | Low-medium minor friction | 2–3° |
Using Sesquisquares in Chart Work
In natal chart analysis, use sesquisquares only when they are tight (within 2°) and when the planets involved are already significant in the chart. A natal Mars sesquisquare Uranus within 1° describes recurring eruptions of restlessness and impulsive action manageable, but a persistent life theme. In transit work, sesquisquares from outer planets to natal chart points time periods of low-grade stress and irritability that call for patience rather than dramatic response.