Surveying
Horizontal distances obtained by thermometric observations

require slope correction
do not require slope and tension corrections
require slope and tension corrections
require tension correction

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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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