Now select your main light - the infinite light you're using for the sun.

Set the xRotate parameter to the negative of your xOrbit value from the camera.
For me, this is xRotate = -42 degrees.

Set the yRotate parameter to the camera yOrbit + 180.
For me this was yRotate = 216+180 = 396.

If the values are correct, the infinite light telltale indicators should line up. There are two.

One is a projection on the ground and should point straight up into the sun.

The other is a projection from the infinite light direction. This one is now viewed edge on. If everything is lined up right, it will form a perfect horizontal white line through the center of the preview.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)