What begins as a nice, smooth ellipsoid becomes an uneven shape with deep folds.
From the sciencedaily.com
It is a slight ellipsoid in shape, with its longest axis directed toward Jupiter.
From the en.wikipedia.org
The Earth is not a sphere, but rather an ellipsoid that is flattened at the poles.
From the en.wikipedia.org
Geometrically, it is a unit vector which is normal to the reference ellipsoid.
From the en.wikipedia.org
A further datum of interest was the ED50 datum based on the Hayford ellipsoid.
From the en.wikipedia.org
The ellipsoid is a mathematically defined regular surface with specific dimensions.
From the en.wikipedia.org
The Earth is not a sphere, but an irregular shape approximating a biaxial ellipsoid.
From the en.wikipedia.org
As an example of why this is important, let us consider the geometry of an ellipsoid.
From the en.wikipedia.org
An ellipsoid which is not an ellipsoid of revolution is called a tri-axial ellipsoid.
From the en.wikipedia.org
More examples
Having the nature or shape of an ellipsoid
A surface whose plane sections are all ellipses or circles; "the Earth is an ellipsoid"
A surface, all of whose cross sections are elliptic or circular (includes the sphere); Such a surface used as a model of the shape of the earth; of or pertaining to an ellipse; ellipsoidal; Shaped like an ellipse; elliptical; Shaped like a symmetrical oval that is evenly tapered on both ends
(ellipsoidal) a three dimensional elliptic shape
Short for Ellipsoidal Spotlight.
(ellipsoidal) a 3D object (e.g., a fruit) that is elliptic in outline.
(ELLIPSOIDAL) A profile lantern with an elliptical reflector and at least one lens. Referred to as a LEKO.
When used to represent the Earth, a solid geometric figure formed by rotating an ellipse about its minor (shorter) axis. Also called spheroid.
The type of reflector used in many profile spots. Often used in America now to refer to all profile spotlights. The reflector is formed in a regular oval shape.