When you see your shadow on a sunny day and you can see your shadow where is the sun?

You wont always see your shadow!

The sun must be shining against you if you see you shadow.

But if you do see your shadow, this is how it happens...

You are standing in the way of the sun rays, so you are like the wall. You can see you wall (shadow) because that is the only place the sun isn't shining!

Hope this helps ya!

It is something to do with the solar Radiation or radiant heat as it travels in straight lines and if its in a cloudy day you cant because the radiant heat energy travels in straight lines.