Linked from
The 22 pages that link to Geodetic datum, each with the reason it gives.
GeodesyRelated: Datums turn geodetic measurements into coordinates tied to a shared Earth model.
LatitudeRelated: Latitude coordinates depend on the Earth model and reference framework being used.
Coordinate reference systemRelated: A datum anchors the CRS coordinates to a model of the Earth.
Oblate spheroidRelated: Earth’s oblate model underlies widely used coordinate reference systems.
Figure of the EarthRelated: A datum ties measurements to a selected ellipsoid and coordinate system.
Circle of latitudeRelated: Latitude values depend on the chosen reference model of Earth.