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From Glossary of Meteorology
In astronomy, the arrangement of the earth, sun, and another planet or the moon in which the angle subtended at the earth between the sun and the third body, in the
plane of the ecliptic
, is 90°.
The first and third quarters of the moon are positions of quadrature.
relationship between two coherent signals in which the
is offset by 90° from the phase of the other. Two signals in quadrature may be regarded as a single
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This page was last edited on 25 April 2012, at 17:41.