pole star
pole star
orpolestar
Pole Star
| Noun | 1. |  pole star - the brightest star in Ursa Minor; at the end of the handle of the Little Dipper; the northern axis of the earth points toward it |
| 单词 | pole star | |||
| 释义 | pole starpole starorpolestarPole Star
pole starPole Starpole starThe star closest to the north or south celestial pole at any particular time. As a result of precession the position of each pole traces out a circle in the sky in a period of about 25 800 years. There is thus a sequence of stars, including Polaris, Vega, and Thuban, that have been and will become again the northern pole star (see illustration). The nearest naked-eye star to the south celestial pole is at present the 5th magnitude star Sigma Octantis. The altitude of the pole star is approximately equal to the local latitude.Pole Star[′pōl ‚stär]pole star
Synonyms for pole star
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