Surveying
In a truly vertical photograph,

Principal point coincides the isocenter
Iso-centre coincides the plumb point
All listed here
Plumb point coincides the principal point

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Surveying
Sidereal day

Is slightly shorter than an ordinary solar day
All listed here
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

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