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appulse

(moment of apparent nearest distance of observed bodies)

An appulse is the occurrence of reaching the shortest apparent distance across the celestial sphere (smallest angular separation) of two astronomical objects (e.g., planets, the Moon, or one of the two might be a star) when they pass apparently close to each other. It describes the way things look, e.g., to the naked eye, and is perhaps more of a curiosity than of any scientific concern.


(astronomy,celestial sphere)
http://en.wikipedia.org/wiki/Appulse

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