Sesquiquadrate

A sesquiquadrate (135°) is a minor friction aspect — a quiet, nagging tension that sits between a square (clear pressure) and a quincunx (incomprehension).

Two planets 135° apart are in sesquiquadrate (also called sesquisquare or square-and-a-half). It combines elements of both the square (friction) and the quincunx (misalignment). The result is a low-level tension that feels less urgent than a square but more pointed than a semi-square. Classical astrologers associated the sesquiquadrate with obsessive or compulsive qualities — not because it creates obsession, but because the friction isn't sharp enough to demand resolution. Instead, it creates a repetitive loop: you notice the same friction, adapt, and then notice it again. In transit, sesquiquadrates correlate with recurring minor frustrations that keep returning until something external changes. They are common during periods of "almost but not quite."

Not: A sesquiquadrate is not a major aspect. It is not as significant as a square or opposition. Its influence is cumulative over time rather than event-forming.

The 135° aspect is considered minor. Its interpretation is less standardized than the five Ptolemaic aspects.