Surveying
The sidereal day is the time interval between two successive upper transits of

Mean sun
First point of Libra
The polar star
First point of Aries

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Surveying
Pick up the correct statement for horizontal photographs.

The two sides of a road meet at the vanishing point
Parallel lines do not appear parallel in central projection
All listed here
The lines parallel to the negative plane are projected as parallel lines

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