No, I mean that you have to re-shade the maps with light coming from the south-east, and display them with the south up. This will give the correct effect for the northern hemisphere.

A more universal solution is to orient your maps with east up (which is a common convention), and light them from wherever the sun is. Then the morning light in the rendered maps will always come from the top (in the equator), top-right (northern hemisphere) and top-left (southern hemisphere).