| 单词 | circle of perpetual apparition |
| 释义 | circle of perpetual apparition [`sǝr·kǝl ǝv pǝr`pech·ǝ·wǝl ap·ǝ`rish·ǝn] ASTRONOMY That circle of the celestial sphere, centered on the polar axis and having a polar distance from the elevated pole approximately equal to the latitude of the observer, within which celestial bodies do not set. |
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