Surveying
In a truly vertical photograph,

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

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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 divided into the conventional hours, minutes and seconds
Is slightly shorter than an ordinary solar day

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

All of these
linear measurements are more accurate than angular measurements
linear and angular measurements of the traverse are of equal accuracy
angular measurements are more accurate than linear measurements

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