Surveying
If the reduced bearing of a line AB is N60°W and length is 100 m, then the latitude and departure respectively of the line AB will be

+70.7 m, -50 m
+50 m, +86.6 m
+86.6 m, -50 m
+50 m, -86.6 m

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Surveying
Circumpolar stars

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

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