North Star
A target that exhibits qualities of fixedness, observability, simplicity, and durability.
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Origin
Referring to Polaris, or the Pole Star, the brightest star in the constellation of Ursa Minor, and due to its position of lying in a nearly direct line from the Earth's orbit, stands almost motionless in the sky, and all the stars of the northern sky appear to rotate around it, making it ideal for navigation as far back as classical antiquity and perhaps further.