Surveying
The orthogonal projection of the perspective centre on a tilted photograph, is called

Nadir
Plumb point
Isocenter
Principal point

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Surveying
The First Point of Aeries

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

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Surveying
Systematic errors

Can be removed by applying corrections to the observed values
Are also known as cumulative errors
Always follow some definite mathematical law
All listed here

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