Surveying
The correction applied to the measured base of length ‘L’ is

Tension = (P - Ps)L/AE
Sag = L³w²/24P² where w is the weight of tape/m
All of these
Slope = (h²/2L) + (h⁴/8L³) where h is height difference of end supports

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Surveying
The First Point of Aeries

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

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