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nadir |
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nadir (nā`dər) [Arab.,=opposite], in astronomy, the point on the celestial sphere celestial sphere, imaginary sphere of infinite radius with the earth at its center. It is used for describing the positions and motions of stars and other objects.
..... Click the link for more information. directly opposite the zenith zenith, in astronomy, the point in the sky directly overhead; more precisely, it is the point at which the celestial sphere is intersected by an upward extension of a plumb line from the observer's location. ..... Click the link for more information. , i.e., directly beneath the observer. nadir the point on the celestial sphere directly below an observer and diametrically opposite the zenith nadir [′nā·dər] (astronomy) That point on the celestial sphere vertically below the observer, or 180° from the zenith. (oceanography) The point on the sea floor that lies directly below the sonar during a survey. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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