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
True horizon
Celestial horizon
Visible horizon

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Surveying
A ’level line’ is a

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
line passing through the center of cross hairs and the center of eye piece

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