Excerpt
Check it out Here: Itchy Animation: Natural lightNatural light comes in a wide range of different flavours, and the difference between them can be enormous. The source of all our natural light is the sun, however it takes on different characteristics at different times of day and in different weather conditions, turning this one source of light into essentially many different ones ranging from hard and warm to soft and cool.
Basic sunshine is essentially described in the diagram in Part 1, this being what most of us would imagine as a normal bright and sunny day.