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

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

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Surveying
The First Point of Aeries

Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
Is usually denoted by the Greek letter ?
Is the point in the celestial sphere where zero meridian crosses the celestial equator
All listed here

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