| 单词 | celestial horizon |
| 释义 | celestial horizon [sǝ`les·chǝl hǝ`rīz·ǝn] ASTRONOMY That great circle of the celestial sphere which is formed by the intersection of the celestial sphere and a plane through the center of the earth and is perpendicular to the zenith-nadir line. Also known as rational horizon. |
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