Surveying
The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called

Sensible horizon
Celestial horizon
Visible horizon
True horizon

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Surveying
A ’level line’ is a

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

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