Surveying
The distance between the minor control point and the principal point should be equal to

Sum of the base lines of stereo pair
Base line of the left photograph of stereo pair
Mean of the base lines of the stereo pair
Base line of the right photograph of stereo pair

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Surveying
Refraction correction

completely eliminates curvature correction
partially eliminates curvature correction
adds to the curvature correction
has no effect on curvature correction

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Surveying
Sidereal day

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
Is divided into the conventional hours, minutes and seconds

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