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nadir

 
('dər, -dîr') pronunciation
n.
  1. Astronomy. A point on the celestial sphere directly below the observer, diametrically opposite the zenith.
  2. The lowest point: the nadir of their fortunes.

[Middle English, from Medieval Latin, from Arabic naẓīr (as-samt), opposite (the zenith), from naẓara, to see, watch.]


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The point on the celestial sphere, blocked from view by Earth, that is diametrically opposite the zenith.
nadir ('dər) [Arab.,=opposite], in astronomy, the point on the celestial sphere directly opposite the zenith, i.e., directly beneath the observer.


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nadir

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pronunciation

IN BRIEF: The lowest point.

pronunciation Her hopes reached their nadir when she learned that his family had intercepted all her letters to him.

Tutor's tip: This word was used in the 2006 Scripps National Spelling Bee finals.

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That point on the celestial sphere directly beneath the observer and directly opposite the zenith (i.e., 180° from the zenith, so that the zenith, nadir, and the center of the earth are in one straight line). Also called a nadir point.

Picture 1 of nadir



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For a list of words related to nadir, see:

  See crossword solutions for the clue Nadir.
Diagram showing the relationship between the zenith, the nadir, and different types of horizon. The nadir is opposite the zenith.

The nadir (from Arabic: نظير / ALA-LC: naẓīr; meaning "opposite") 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 there. Since the concept of being below is itself somewhat vague, scientists define the nadir in more rigorous terms. Specifically, in astronomy, geophysics and related sciences (e.g., meteorology), the nadir at a given point is the local vertical direction pointing in the direction of the force of gravity at that location. The direction opposite of the nadir is the zenith.

Nadir also refers to the downward-facing viewing geometry of an orbiting satellite,[1] such as is employed during remote sensing of the atmosphere, as well as when an astronaut faces the Earth while performing an EVA.

This diagram depicts a satellite observing backscattered sunlight in the nadir viewing geometry.

The word is also used figuratively to mean the lowest point of a person's spirits,[2] or the quality of an activity or profession.[3]

The term nadir can also be used to represent the lowest point reached by a celestial body during its apparent orbit around a given point of observation. This can be used to describe the location of the Sun, but it is only technically accurate for one latitude at a time and only possible at the low latitudes. The sun is said to be at the nadir at a location when it is at the zenith at the location's antipode.

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References



Translations:

Nadir

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Dansk (Danish)
n. - laveste punkt, nadir

Nederlands (Dutch)
dieptepunt, nadir

Français (French)
n. - (Astron) nadir, (fig) point le plus bas

Deutsch (German)
n. - Fußpunkt, Tiefpunkt

Ελληνική (Greek)
n. - (αστρον.) ναδίρ, (μτφ.) κατώτατο σημείο

Italiano (Italian)
nadir

Português (Portuguese)
n. - nadir (m) (Astr.), ponto mais baixo

Русский (Russian)
надир, низшая точка

Español (Spanish)
n. - nadir, punto más bajo

Svenska (Swedish)
n. - nadir, bottenläge

中文(简体)(Chinese (Simplified))
天底, 最低点, 最底点

中文(繁體)(Chinese (Traditional))
n. - 天底, 最低點, 最底點

한국어 (Korean)
n. - 천저, (운명 등의) 밑바닥

日本語 (Japanese)
n. - 天底, 最下点, どん底

العربيه (Arabic)
‏(الاسم) الحضيض, لحظه احباط او فشل كبير‏

עברית (Hebrew)
n. - ‮נקודת השפל, נדיר, נקודה בשמים הנמצאת מתחת לרגלי המתבונן, מנוגדת לזנית‬


 
 
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American Heritage Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Wiley Book of Astronomy. Copyright © 2004 by Wiley-Blackwell. Wiley and the Wiley logo are registered trademarks of John Wiley & Sons, Inc. and/or its affiliates in the United States and other countries. Used here by license.  Read more
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