I know this has been posted before but it's something that could be good for discussion!

Why is the sky blue??

Could it be the Earth is moving so fast that light shifts to the blue end of the spectrum, thus we see the sky as blue, or could it be that as we look to the heavens we see 'soul'? :)

Also is it fact that the Sun is spherical?

This may seem like a silly question but I suppose one could consider the sun to be a revolving 'portal' to heaven (which may sound childish), and we only see it's one side because it is revolving to some specific design. I mean we cannot view it directly because it's light is too powerful, and is there really anything to say light is not passing though this 'portal' (I know this sounds sad!) from heaven? It is also impossible to get anywhere near the sun while one has a body!

I beleive Darwin misunderstood notions of the Sun being some kind of a creator. I know the Egyptians wrote about the Sun being some kind of a creator, and I know in the Bible God is supposed to be 'the light', and I firmly beleive light has special qualities! :)

p.s. has anyone actually noticed (on a cloudy day when it's possible to view it better) how perfectly circular the sun actually is??

Well, white light consists of a spectrum of colours, and each of them has a different wavelenght. So blue light, one of the colours of the spectrum, has one of the shortest wavelenghts (violet being the shortest.) So, in comparison with other types of light within white light (like red light) and according to Rayleigh, blue light is scattered more.

Now, the atmosphere is made up of gases as you know, and there are Nitrogen particles as well as oxygen, et al. The blue light gets scattered due to this particles (it collides); it has the shortest wavelenght in the spectrum thus producing the largest scattering. Now, we dont see it violet because its easier for the eye to detect blue. And thus you see a blue sky :)

I like your poetic hypothesis better though:p
When I look up at the sky I dont consider scattering or diffraction, just how beautiful it is. And the powerful presence of the sun is overwhelming, I believe.

The Sun is in space
Where man has been in time past
The sun will survive
(haiku)

we can photograph the sun.
http://www.spacescience.org/ExploringSpace/SpaceWeather/TrackingTheSun/1.html
http://antwrp.gsfc.nasa.gov/apod/ap980515.html
http://www.jeffreybennett.com/virtual_tour/sun.html

And the sun doesn't rotate syncronosly with the orbit of the earth around the sun, like the moon does with the earth. It spins a bit faster than the earth orbit it, IIRC.

I still find the sun amazing to behold.

http://www.lmsal.com/YPOP/homepage.html
http://www.nasa.gov/multimedia/imagegallery/image_feature_64.html

The last one is a close-up of the sun's surface, the rolling and roiling plasma and burning gasses.