# quadrature

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## quadrature,

in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point is the earth and the sun is one of the bodies, a planet is in quadrature when its elongationelongation,
in astronomy, the angular distance between two points in the sky as measured from a third point. The elongation of a planet is usually measured as the angular distance from the sun to the planet as measured from the earth.
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is 90°. As viewed from the earth, the half-moon is in quadrature to the sun. The inferior planets (Mercury and Venus) never reach quadrature; the superior planets each have two points of quadrature in their orbits.

## quadrature

(kwod -ră-cher) The position, or aspect, of a body in the Solar System when its elongation from the Sun, as measured from the Earth, is 90°, i.e. when the angle Sun–Earth–body is a right angle.

## quadrature

[′kwä·drə·chər]
(astronomy)
The right-angle physical alignment of the sun, moon, and earth.
(mathematics)
The construction of a square whose area is equal to that of a given surface.
The process of calculating a definite integral.
(physics)
State of being separated in phase by 90°, or one quarter-cycle. Also known as phase quadrature.
References in periodicals archive ?
In the paper, it is assumed, that the quadrature booster is represented by the model to be shown in Fig.
QUADRATURE DEMODULATION OF AM RADIO SIGNAL SUPERIMPOSED WITH HV NOISE
As we can observe, the convergence of the quadrature sums is very fast.
Each of the above three quadrature rules (6), (7) & (8) is of precision five.
The estimation of the error in a quadrature formula is an important problem.
This letter proposes new high-performance CMOS QVCO consisted of two differential Colpitts cross-coupled VCOs  coupled via four pairs of varactors to provide the quadrature phase.
Moreover, it was proved that the Lebesgue constant of such angles is O (log n) and that the associated interpolatory trigonometric quadrature formula has positive weights.
IF1] is very high, the quadrature accuracy of LO2 signal is difficult to maintain and the output low-pass bandwidth of the RC load at the first-stage mixer is difficult to achieve .
A family of Quadrature Clock Converter ICs from LSI Computer Systems is designed to interface between incremental encoders and counting devices by converting the encoder quadrature outputs into directional up/down clocks or clock and direction signals.
The PC/104 quadrature input boards can be used in embedded motion control, instrumentation, robotics, industrial machinery, process control and monitoring.

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