Surveying
Longitude of a place is the angular distance between the meridian of the place and

The International Date Line
Both (A) and (C) of above
The standard meridian
That of Greenwich

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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
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level

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