[PROJ] Geodetic vs Geocentric

[Even Rouault]

| -ocentric latitude (angle between the equatorial plane and the point 
on the ellipsoid)

Actually: angle between the equatorial plane and the vector from the 
center of the ellipsoid to the point of interest

And we have actually a nice schema at 
https://proj.org/en/9.3/operations/conversions/geoc.html :-)

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