Light positions in MB3D?

[Stonevoice]

Hi,
I was wondering about the positioning of lights in MB3D, and what the sliders refer to when moving lights.
For examle, when using a global light, there are two sliders, one to adjust the Light Yangle, and one to adjust the Light Xangle. What do these angles refer to? Where is a global light located, for example, when both sliders are a t the default position? Is it directly overhead? Is it at the camera position?

I have tried moving the light around to get some idea what the angles refer to, and every time I think I understand, I find I don't!

[Stonevoice]

I figured it out for myself.
Thanks for all your help.

[cKleinhuis]

please include the solution !!!! it makes no sense to ask for a problem and just tell it is solved ... to give such posting a meaning,
INCLUDE THE SOLUTION!