Geodetic vs Geocentric Coordinates

This is the simplest visualisation / explanation I could find.

450px-geocentric_vs_geodetic_latitude-svg

AP refers to geocentric coordinates. Reference point is always A, the centre of the earth.
IP refers to geodetic coordinates, where IP is the normal (perpendicular) to the plane of where you are. Reference point I differs depending where on the earth you are (P).

Source: https://en.wikipedia.org/wiki/Geodetic_datum

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