Surveying
The point at which sun's declination changes from north to south, is known as

First point of Libra
Vernal Equinox
First point of Aeries
Both (B) and (C) of the above

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Surveying
Homologous points are

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

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