| 释义 |
Circle of perpetual apparition
| See under Circle. | | at any given place, the boundary of that space around the elevated pole, within which the stars never set. Its distance from the pole is equal to the latitude of the place. | | See under Circle. |
See also: Apparition, Circle, Perpetual circle of perpetual apparition
circle of perpetual apparition[′sər·kəl əv pər′pech·ə·wəl ap·ə′rish·ən] (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. |