circumpolar star


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circumpolar star,

star whose diurnal circlediurnal circle
, apparent path followed by a star due to the earth's rotation on its axis. The stars appear to move on the celestial sphere in concentric circular paths centered at the celestial poles.
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 lies completely above or completely below an observer's horizon. A star whose diurnal circle lies above the horizon never sets, even though it cannot be seen during the day. Designation of a star as circumpolar depends on the observer's latitude. At the equator no star is circumpolar. At the North or South Pole all stars are circumpolar, since only one half of the celestial sphere can ever be seen. For an observer at any other latitude a star whose declination is greater than 90° minus the observer's latitude will be circumpolar, appearing to circle the celestial pole and remaining always above the horizon. A constellation made up entirely of circumpolar stars is also called circumpolar. From most of the N United States (above lat. 40°N) the Big Dipper is circumpolar.

circumpolar star

[¦sər·kəm′pō·lər ′stär]
(astronomy)
A star with its polar distance approximately equal to or less than the latitude of the observer.
References in periodicals archive ?
Polaris is a circumpolar star, and so it is always seen close to the direction of true north.
First of all, despite its overall dimness, the north has several easily spotted circumpolar star patterns that are always there for easy guidance.
High in the northwest on January evenings are Cepheus and Cassiopeia, circumpolar star groups we normally view in autumn.
Most of our experiments were done centered on the equatorial region of the sky; the exposure gaps, however, were minimized when we shot circumpolar star fields.
For quite a few readers living farther north than the 40[degrees] latitude for which the map is designed, Capella is a circumpolar star (it never sets).
UZ Volantis is a south circumpolar star, observable from the Southern Hemisphere any night of the year, all night long.
These stars are known as circumpolar stars and the constellations they belong to are called circumpolar constellations.
Esoteric Egypt" reveals that the ancient Egyptians believed in reincarnation and a spiritual evolutionary process; explains the connections between the movements of Orion and Sirius and the story of Osiris and Isis, the importance of the Pleiades and circumpolar stars to the Egyptians, and the fundamental unity of the Egyptian pantheon; and investigates the people who colonized greater Egypt 100,000 years ago, descendants of the Atlanteans.
Because opposing asterisms can only be found with the help of circumpolar stars, which are always in the sky.
These are known as circumpolar stars and all seem to move in a circular path around the Pole Star (Polaris).
Stars that are near Polaris are called circumpolar stars and can be seen throughout the year.
Circumpolar stars cross the north-south meridian of the sky twice every 24 hours: first above and then below the celestial pole.