Quadrature

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Quadrature

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1. An elongation of 90 degrees, usually specified as east or west in accordance with the direction of the body from the sun. The moon is at quadrature at first and last quarters. Compare conjunction. </dd>
2. The situation of two periodic quantities differing by a quarter of a cycle. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use