# nadir

/ˈneɪdɝ/ (US) · /nˈædiə/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/nadir
Updated: 2026-05-20

## Definition

the lowest point in the sky that a star or planet reaches. It is the opposite of the highest point, called the zenith.

For teachers: the lowest point in the sky reached by a celestial body, specifically the point where it is farthest from the zenith. Often used in astronomical contexts to describe the position of a star or planet relative to an observer.

## Examples

- The star reached its nadir just before midnight.
- As the planet moved toward its nadir, the light from its surface became much dimmer and harder to observe.
- The astronomer noted that the comet's trajectory would bring it to its nadir within the next hour, providing a unique opportunity for high-resolution imaging of its tail.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.