Surveying
The permissible error in chaining for measurement with chain on rough or hilly ground is

1 in 1000
1 in 500
1 in 250
1 in 100

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Surveying
Sidereal day

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

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