Surveying
The latitude of the observer's position, is

Angular distance along the observer's meridian between equator and the observer
Declination of the observer's zenith
Elevation of the elevated pole
All listed here

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Surveying
Spring tides are caused when

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

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