Surveying
Homologous points are

Nodal points of the camera lens
Opposite corners of a photograph
Corresponding points on the ground and photograph
Plumb points of stereo pair of photographs

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Surveying
The First Point of Aeries

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

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