Quadrature

With quadrature is called:

In astronomy, a constellation form a geocentric angle of 90 ° in the heavenly bodies - see quadrature,
In physics and electrical engineering, a phase shift of a periodic signal by 90 ° - see quadrature amplitude modulation,
In mathematics to calculate the surface area of a limited range of curves - see squaring of the circle and Numerical quadrature (numerical integration). The term is obsolete, instead, is today the more general concept of integration is usually used.
In the architecture of a proportion key - see Proportion (architecture).

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