SPHERE allows you to create a line mesh that approximates
a sphere. 

Create the mesh by choosing from the following options:

CTR+RAD - to create a mesh given the center and radius of
a sphere, as well as the number of longitude and latitude
lines in the sphere.

Locate the center of the sphere, using a Position Menu
option.

Enter a number greater than 0.0 to be used as the sphere
radius.

Enter the number of longitude and latitude lines and press
<Enter> after each entry.

CTR+DIA - to create a mesh given the center and diameter 
of a sphere, as well as the number of longitude and 
latitude lines in the sphere.

Locate the center of the sphere, using a Position Menu
option.

Enter a number greater than 0.0 to be used as the sphere
diameter.

Enter the number of longitude and latitude lines.

Indicate whether or not you want to group the entities.
Choose NO to continue without grouping. Choose YES to 
create a group, and enter a group name.

The mesh is displayed.
