Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Perspective centre
Principal point
Plumb point
Isocenter

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
An arc of the great circle which passes through the place and is perpendicular to the equator
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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