Dictionary of Space Concepts

Media

Definitions

Short Definition
In astronomy, Nadir is a point on the celestial sphere that is directly below the
observer. The nadir is diametrically opposite to the zenith.

Detailed Definition
In astronomy, nadir lies on the intersection of the celestial sphere with the imaginary line passing from the observer through the centre of Earth. The direction of nadir matches that of the gravitational force. The nadir and the zenith form two poles of the horizon.

In medicine, nadir is predominantly used to describe blood cell counts at their lowest during chemotherapy. Each chemotherapy treatment comes with the nadir period. Figuratively, nadir means the lowest point and may be used to emphasize the state of one’s feelings, quality of activity and affairs.

Etymology
From Medieval Latin nadir, from Arabic naẓīr as-samt, composed of naẓīr
“counterpart, corresponding to” and as-samt“the zenith”

Sample Sentences

A nadir image is a satellite image or an areal photo of Earth taken vertically in the downward alignment.

During chemotherapy, the nadir time usually comes in about 10 days after the start of treatment, although this is mostly dependent on drugs given.

The relationship between the USA and USSR reached its nadir in the 1980s.

Translations of Terms/Concepts into Partner Languages

French
le nadir

German
der Nadir

Italian
il nadir

Polish
nadir

Swedish
nadir

Additional Translations of Terms/Concepts into Other Languages

Russian
надир

Ukrainian
надир

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