Shades of Blue Sky
What are the different shades of blue of the sky?
Hi, William !!!
As you know, the sun emits the solar spectrum, which consists
of a continuous distribution of all the electromagnetic waves.
When such range of wave lengths reach the atmosphere, a part
of the spectrum is diffused, specially that part that has wave length
compatible with the atmospheric substances. It happens than,
consequently, that the sky seems to us "blue", because of that
diffusion process. Depending on the dust content on air,
humidity content, and several other conditions, the "blue" may
be deeper or not in the sky. And that is why you see different
shades of blue.
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Update: June 2012