Surveying
The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than

None of these
0.01 second
0.0001 second
0.001 second

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Surveying
Circumpolar stars

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

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