Astrophysics (Index)About


(moment of apparent nearest distance of observed bodies)

An appulse is a celestial event consisting of two astronomical objects reaching their shortest apparent distance across the celestial sphere (smallest angular separation) when the two apparently pass 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. Among the possible objects are planets or the Moon, and one of the two might be a star.

(astronomy,celestial sphere)
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