[R] Visualizing Points on a Sphere

[Lorenzo Isella]

Dear All,
I need to plot some points on the surface of a sphere, but I am not sure 
about how to proceed to achieve this in R (or if it is suitable for this 
at all).
In any case, I am not looking for really fancy visualizations; for 
instance you can consider the images between formulae 5 and 6 at

http://bit.ly/hOgK9h

Any suggestion is appreciated.
Cheers

Lorenzo