Surveying
The altitude of a heavenly body is its angular distance, measured on the vertical circle passing through the body, above

Horizon
Pole
None of these
Equator

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Surveying
A ’level line’ is a

line parallel to the mean spheriodal surface of earth
line passing through the center of cross hairs and the center of eye piece
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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