Surveying
The following points form a pair of homologous points:

Photo plumb point and ground plumb point
Photo principal point and ground principal point
All listed here
Photo isocenter and ground isocenter

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is up

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