Surveying
The cross hairs in the surveying telescope are placed

much closer to the objective lens than to the eye piece
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

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Surveying
Sidereal day

All listed here
Is divided into the conventional hours, minutes and seconds
Is the period of time taken by the earth in making a complete rotation with reference to stars
Is slightly shorter than an ordinary solar day

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Surveying
Refraction correction

has no effect on curvature correction
partially eliminates curvature correction
adds to the curvature correction
completely eliminates curvature correction

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