Specifically, in astronomy, geophysics and related sciences (such as meteorology), the nadir at a given point is the local vertical direction pointing in the direction of the force of gravity at that location.

NADIR definition: 1. the worst moment, or the moment of least hope and least achievement: 2. the point at which…. Learn more.

The source of nadir is naḍhīr, meaning "opposite"—the opposite, that is, of the zenith, the highest point of the celestial sphere which is positioned vertically above the observer. (The word zenith itself is a …

NADIR definition: the point on the celestial sphere directly beneath a given position or observer and diametrically opposite the zenith. See examples of nadir used in a sentence.

Definition of nadir noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

zenith, nadir - Zenith derived from Arabic samt ar-ras, "the way or road above one's head"; zenith technically is the point directly above the observer and nadir is the point directly below.

Nadir is a term used in astronomy for the point in the heavens exactly opposite to the zenith, the zenith and nadir being the two poles of the horizon. That is, the zenith is directly overhead, the nadir directly …

Dec 24, 2025 · Diagram showing the relationship between the zenith, the nadir, and different types of horizon. Nadir is opposite the zenith.

Nadir is a fascinating word that refers to the lowest point of something, often used metaphorically to describe a situation, mood, or performance. It's the opposite of "zenith," which means the highest point.

In fact, nadir is derived from the Arabic nazir, which means “opposite to.” It is still used in astronomy to indicate the part of the celestial sphere located directly below an observer, but also more generally to …