North Star
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Polaris, the brightest star in the constellation Ursa Minor, used historically for celestial navigation to determine true north.
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Mentioned once in The Unkindest Cut Of All.
The Unkindest Cut Of All
Season 2 · Episode 2 · S02E02
“look into the heavens and see if you can spot the North Star. Then you want to turn twelve degrees to your right”