Surveying
The following points form a pair of homologous points:

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

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Surveying
Spring tides are caused when

None of these
Solar tidal force acts opposite to lunar tidal force
Sun and moon are in line with earth
Solar tidal force and lunar tidal force both coincide

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