天底 tiāndǐ nadir Definitions Defs Origin Strokes Stroke Words Sentences Sents 天底 tiāndǐ nadir In astronomy, the point on the celestial sphere directly below an observer and opposite the zenith sky The bottom of the sky; the sky Cross-References Antonym 天顶 tiāndǐng
天底 tiāndǐ nadir In astronomy, the point on the celestial sphere directly below an observer and opposite the zenith sky The bottom of the sky; the sky Cross-References Antonym 天顶 tiāndǐng
