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polestar

[pohl-stahr] /ˈpoʊlˌstɑr/
noun
1.
2.
something that serves as a guiding principle.
3.
something that is the center of attention or attraction.
Origin
1545-1555
1545-55; pole2 + star
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pole star

pole star

noun
1.
a guiding principle, rule, standard, etc

Pole Star

noun
1.
the Pole Star, the star closest to the N celestial pole at any particular time. At present this is Polaris, but it will eventually be replaced by some other star owing to precession of the earth's axis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for pole star

North Star

the brightest star that appears nearest to either celestial pole at any particular time. Owing to the precession of the equinoxes, the position of each pole describes a small circle in the sky over a period of 25,800 years. Each of a succession of stars has thus passed near enough to the north celestial pole to serve as the polestar. At present the polestar is Polaris; Thuban (alpha Draconis) was closest to the North Pole about 2700 BC, and the bright star Vega (alpha Lyrae) will be the star closest to the pole in AD 14000. The location of the northern polestar has made it a convenient object for navigators to use in determining latitude and north-south direction in the Northern Hemisphere. There is no bright star near the south celestial pole; the present southern polestar, sigma Octantis, is only of the 5th magnitude

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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6
8
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