circle of perpetual occultation


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circle of perpetual occultation

[′sər·kəl əv pər′pech·ə·wəl ‚äk·əl′tā·shən]
(astronomy)
That circle of the celestial sphere, centered on the polar axis and having a polar distance from the depressed pole approximately equal to the latitude of the observer, within which celestial bodies do not rise.