Diagram showing the relationship between the zenith, the nadir, and different types of horizon. Nadir is opposite the zenith.



  • The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place of observation.
  • The lowest point; time of greatest depression.
  • The axis of a projected conical shadow; the direction of the force of gravity at a location; down.
  • An empty box added beneath a full one in a beehive to give the colony more room to expand or store honey.



  • From Medieval Latin nadir, from Arabic نَظِير السَّمْت, composed of نَظِير and سمت.

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