Surveying
The following sights are taken on a “turning point”

foresight and backsight
foresight and intermediate sight
foresight only
foresight only

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Surveying
The First Point of Aeries

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

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Surveying
Refraction correction

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

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