Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To plot the chain lines
To plot the offsets
To increase the out-turn
To indicate the accuracy of the survey work

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Surveying
Sidereal day

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

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