The nadir is the point on the celestial sphere directly beneath the observer, opposite the zenith.
天底是天球上直接位于观测者下方、与天顶相对的点。
| Expression | 天底天球上，在观测者垂直向下的一点，与天顶完全相对 |
|---|---|
| Meaning | A point on the celestial sphere directly below the observer, diametrically opposite the zenith. |
| Reading | tiāndǐ tiānqiú shàng zài guāncèzhě chuízhí xiàngxià de yīdiǎn yǔ tiāndǐng wánquán xiāngduì |
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