Are you using the "lat long at apex" feature on the Planet node? If there is only one site you need to locate to, you can enter its lat-long coordinates on the Planet node and it will move all of the georeferenced shaders to put that lat-long position at the "top" of the planet, which is usually at (0,0,0), assuming the planet is still in its default position. Then an XYZ position of (0,0,0) should be at precisely that lat-long position. Relocating the scene near the origin makes various things a lot easier to do.
I hope that helps in your case. We should be able to add lat-long position controls to the camera in future.
Matt