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Opposition

(positioning of two astronomical objects 180 degrees apart in the sky)

Opposition is the placement of two astronomical objects (e.g., planets) so they are 180 degrees apart on the Celestial Sphere. For example, if Earth and Jupiter, are aligned with the Sun so Jupiter is at the Zenith (straight up in the sky) at the place on Earth that is at midnight, then the Sun and Jupiter are in opposition.


(astronomy)
http://en.wikipedia.org/wiki/Opposition_(planets)

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