Decals Mapping Spherical
Spherical mapping applies to spherical objects, including partial spheres.
Images are essentially zero dimension at the center of the sphere and
expand with the size of the sphere as they are projected onto the inside
of the sphere. Images converge as they approach a pole.
Mapping
Mapping type. When you select
Spherical, latitude and longitude
lines appear in the graphics area circumscribing a bounding box around
the object. The decal reference axis goes from the south pole to the north
pole.
Offset latitude 
. Specify the angle of the decal from zero latitude, up to
360° around
the sphere.
Offset longitude 
. Specify the angle of the decal from zero longitude, up to
180° up
and down (from pole to pole).
Size/Orientation
In addition to the options for all mapping types, spherical mapping
includes control of the frame (i.e., orientation of the latitude and longitude
lines, including the positions of the poles). The default position of
the poles is aligned with the world space X axis (shown in the reference triad).
Axis direction 1 
. Rotates the longitude lines around the Z axis, which might
have been rotated by Axis direction 2.
Axis direction 2 
. Revolves the latitude lines around the Y axis.
.