Surveying
The following points form a pair of homologous points:

Photo isocenter and ground isocenter
Photo plumb point and ground plumb point
Photo principal point and ground principal point
All listed here

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Surveying
The First Point of Aeries

All listed here
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
Is usually denoted by the Greek letter ?

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Surveying
For mapping any country

Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys

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