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quadrature

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

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

A Dictionary of Astronomy | 1997 | 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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"quadrature." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O80-quadrature.html

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quadrature

A Dictionary of Earth Sciences | 1999 | | Copyright

quadrature See IMAGINARY COMPONENT.

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AILSA ALLABY and MICHAEL ALLABY. "quadrature." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "quadrature." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O13-quadrature.html

AILSA ALLABY and MICHAEL ALLABY. "quadrature." A Dictionary of Earth Sciences. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-quadrature.html

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