Surveying
The maximum error in radial line assumption, is

h/H f tan θ
h/H f² sin θ
h/H f cos θ
h/H f² tan θ

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Surveying
The First Point of Aeries

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