# quadrature

## Quadrature in astronomy

In astronomy, quadrature is the configuration when the Moon or a planet lies at angular distance of 90° east or west of the Sun as seen from Earth.

## Quadrature in mathematics

In mathematics, quadrature is the determination of the area of a geometric figure. This may be done in geometric or arithmetic terms.

### Geometric quadrature

Here the task is to construct a square figure of area equal to the given one, and traditionally by ruler and compass alone. The quadrature of the circle cannot be carried out by ruler and compass.

### Arithmetic quadrature

Here the area is to be calculated in numerical terms.