Answer to Question #12288 in Optics for TJ

Question #12288

I keep reading about how the sky isn’t actually blue, but violet.
Such as here: http://answers.yahoo.com/question/index?qid=20090324145007AAdcahf

(Please answer all of these if you can help me)

1.) Are these statements about the sky really being violet true or just rumors?

2.) If it is true, is there a way of knowing the sky’s exact shade of violet?

3.) I have to figure this out. What is the real obstacle for us not being able to see it?
From what I've read, it's one of these two:

- Ozone

- Ultraviolet radiation

- Or is it both?

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