Surveying
The allowable length of an offset depends upon the

All of these
scale of plotting
degree of accuracy required
method of setting out the perpendiculars and nature of ground

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Surveying
The First Point of Aeries

All listed here
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

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