Surveying
In the double application of principle of reversion, the apparent error is

four times the true error
two times the true error
half the true error
equal to true error

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Surveying
The First Point of Aeries

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

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