Surveying
Longitudes are measured from 0° to

360° eastward
180° east or westward
180° eastward
180° westward

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Surveying
The meridian of a place is

An arc of the great circle which passes through the place and is perpendicular to the equator
A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
A great circle passing through the place and the poles

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