Surveying
Sidereal day

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

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Surveying
The cross hairs in the surveying telescope are placed

much closer to the eye-piece than to the objective lens
anywhere between eye-piece and objective lens
midway between eye piece and objec-tive lens
much closer to the objective lens than to the eye piece

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Surveying
Homologous points are

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

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