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ESA Data Ontology

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Concept information

... > Observational astronomy > Astronomical techniques > Astrometry > Astronomical coordinate systems > Horizontal coordinate system > Nadir

Preferred term

Nadir  

Definition

  • The point on the celestial sphere blocked from view by Earth and diametrically opposite to the zenith. (en)

Broader concept

Contributor

Editorial note

URI

http://astrothesaurus.org/uat/1086

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