Surveying
The station where observations are not made, but the angles at the station are used in triangulation series, is known as

Satellite station
Main station
Subsidiary station
Pivot station

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

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