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nadir

File:Zenith-Nadir-Horizon.svg · Wikimedia Commons · See Wikimedia Commons

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nadir

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thumb|300px|right|Diagram showing the relationship between the zenith, the nadir, and different types of [[horizon. Note that the zenith is opposite the nadir.]]

AI overview

The nadir is the point in the sky directly below you, opposite to the zenith (which is directly above). It matters because it helps astronomers and navigators describe positions in the sky using a consistent reference system.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Instance of
vertical orientation
Part of
celestial sphere
Show 2 more facts
opposite of
zenith
on focus list of Wikimedia project
Wikipedia:Vital articles/Level/4
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~3 min read

Encyclopedic overview

7 sections
Contents
  • Etymology
  • Definitions
  • Space science
  • Medicine
  • Figurative usage
  • Notes
  • References

thumb|300px|right|Diagram showing the relationship between the zenith, the nadir, and different types of [[horizon. Note that the zenith is opposite the nadir.]]

The nadir is the direction pointing directly below a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface.

Excerpted from Wikipedia’s “nadir” article, available under the CC BY-SA 4.0 licence.

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