Surveying
While making astronomical observations, the observer is mainly concerned with

The direction of the star from the instrument
The direction of the poles of the celestial sphere
The direction of the vertical, the axis of rotation of the instrument
All listed here

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Surveying
The cross hairs in the surveying telescope are placed

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

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