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Quadrature

Term that describes two celestial bodies appearing to be ninety degrees apart, from the perspective of the observer. The position of the Moon or a planet when it is at right angles to the Sun. The Moon is in first quarter phase when it is in east quadrature to the Sun and last quarter phase when it is in west quadrature.

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  • Part of Speech: noun
  • Synonym(s):
  • Blossary:
  • Industry/Domain: Astronomy
  • Category: Moon
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