Surveying
Circumpolar stars

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

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
midway between eye piece and objec-tive lens
much closer to the objective lens than to the eye piece

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