Surveying
If α, H, A and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude λ, the following relation holds good

sin α = sin λ/sin δ
sin A = cos δ/cos λ
cos H = tan λ/tan δ
All listed here

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Surveying
The cross hairs in the surveying telescope are placed

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

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