Surveying
Right ascension of a heavenly body is its equatorial angular distance measured

Westward from the first point of Aeries
Eastward from the first point of Aeries
Westward from the first point of Libra
Eastward from the first point of Libra

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Surveying
Circumpolar stars

Remain always above the horizon
Are seldom seen near the pole star
Rotate round the North Pole
Rotate round the celestial pole

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