The ground light
The last light source will represent the light reflected up from the ground. Create a very dim parallel light source. Place it directly below the world center. Usually this light would fade rapidly but in this example it will remain undiminished. This lay out is intended to be general purpose and used with as little manual adjustment as possible.
Of course, the numbers listed above for the number of sources and their strength are just suggestions. Some "days" could use sun arrays that use the peak 255 illumination. A world light set with a large number of very dim sources would be useful for mimicing an over cast day. A few inactive axes could be added for those occassions when special lighting conditions are present. Each variation can be saved as a state. Note that morphing between world light states during an anim is likely to create very large files, since every pixel is likely to change as the lights alter.
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