The point on the celestial sphere directly opposite to the Pleiades star cluster.
From Greek anti- (opposite) + Pleion (the Pleiades, a star cluster). An astronomical term describing the antipodal point relative to this famous constellation.
The Pleiades are the most famous star cluster in the sky, visible to naked eye and sacred to many cultures—so naturally astronomers created 'antipleion' to name its opposite point in the heavens, showing how naming patterns follow symmetry.
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