Surveying
Homologous points are

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

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Surveying
Sidereal day

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

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Surveying
Theodolite is an instrument used for

measurement of both horizontal and vertical angles
tightening the capstan-headed nuts of level tube
measurement of horizontal angles only
measurement of vertical angles only

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