User:Datumizer/Sandbox/Surface of latitude
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Fig. b. However, it would be more accurate to say that on a spherical Earth, a circle of latitude forms a cone pointing toward the Earth's center.
Fig. c. But the Earth deviates from a perfect sphere, and instead roughly forms the shape of an ellipsoid
(greatly exaggerated in this image), causing this cone to become truncated. This representation corresponds to "geodetic latitude".Figure d is apparently not true. See: here.