Earth is not a sphere. Earth may be described as
an oblate spheroid with some variation.
The earth's diameter is larger at the equator.
Additionally mountains and oceans modify the shape
of the earth.
Some people say the earth is slightly tear drop shaped caused
by the gravitational pull of the sun.
The minor axis is the smaller radius of an ellipse.
The major axis is the larger radius of an ellipse.
rotated around it's minor axis is considered an oblate spheroid.
If an ellipse's major and minor axes are equal in diameter, then
the ellipse is a
A sphere results from rotating a circle around either axis.
Interactive 3D Moon
Glowing Earth Animated GIF.
Seven Thunder Software
prepared the earth animation with visual effects.