Surveying
The angle between the axis of earth and the vertical at the station of observation is called

Astronomical co-latitude
Co-declination of star
Astronomical latitude
Declination of star

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Surveying
In triangulation surveys

All listed here
The area is divided into triangular figures
Sides are not measured excepting the base line
Control stations are located from which detailed surveys are carried out

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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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