Surveying
If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to

1/d2
d2
1/d
d

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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
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
All listed here

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