Surveying
The latitude of a place was obtained by subtracting the zenith distance of a star from its declination, the observed star was between

Pole and horizon
Horizon and equator
Zenith and pole
Equator and zenith

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Surveying
Accidental errors

All of these
Are generally small
Cannot be removed by applying corrections to the observed values
Do not follow any definite mathematical law

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Surveying
In triangulation surveys

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

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