Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Perspective centre
Plumb point
Isocenter
Principal point

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Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
All listed here
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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