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

Subsidiary station
Satellite station
Main station
Pivot station

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Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
quicker and less tedious for large number of intermediate sights
is not suitable for levelling with tilting levels
is less accurate than height of instrument method

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Surveying
Sidereal day

Is slightly shorter than an ordinary solar day
All listed here
Is divided into the conventional hours, minutes and seconds
Is the period of time taken by the earth in making a complete rotation with reference to stars

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