Quadrature
AspectThe classical synonym for the square: a 90° aspect between two planets.
Quadrature is the classical, scholarly term for what is commonly called a square in modern astrology. It is a 90° aspect between two planets, considered tense and dynamic. The word “quadrature” comes from the Latin quadratura, which denotes the angular position of a quarter of a circle. In astronomy, we speak of quadrature to describe the position of a celestial body at 90° from the Sun as seen from Earth. In astrology, quadrature retains this notion of a right angle that generates tension. Classical French authors (Barbault, Gouchon, Antarès) readily used this term. Today, the two terms coexist: “quadrature” in technical texts and “square” in everyday language. The interpretation is strictly identical.