quadrature

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quadrature

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 elongation 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.

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"quadrature." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 19 Dec. 2009 <http://www.encyclopedia.com>.

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quadrature

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

quadrature See IMAGINARY COMPONENT.

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AILSA ALLABY and MICHAEL ALLABY. "quadrature." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 19 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "quadrature." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 19, 2009). http://www.encyclopedia.com/doc/1O13-quadrature.html

AILSA ALLABY and MICHAEL ALLABY. "quadrature." A Dictionary of Earth Sciences. 1999. Retrieved December 19, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-quadrature.html

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quadrature

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

quadrature The occasion when a body in the Solar System has an angular separation, or elongation, of 90 ° east or west of the Sun.

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