Surveying
If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer, then the azimuth of the star at elongation is given by

None of these
tan z = sec φ . cos δ
sin z = sec φ . cos δ
cos z = sec φ . cos δ

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Surveying
Homologous points are

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

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