Surveying
The First Point of Aeries

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
Is usually denoted by the Greek letter ?
All listed here

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Surveying
Refraction correction

adds to the curvature correction
completely eliminates curvature correction
partially eliminates curvature correction
has no effect on curvature correction

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