Surveying
The latitude (λ) of a place and the altitude (α) of the pole are related by

λ = 90° - α
λ = α - 90°
λ = 180° - α
λ = α

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Surveying
Homologous points are

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

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