Surveying
Sidereal day

All listed here
Is divided into the conventional hours, minutes and seconds
Is slightly shorter than an ordinary solar day
Is the period of time taken by the earth in making a complete rotation with reference to stars

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Surveying
Homologous points are

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

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