I wrote following article for discuss-lfm (live from mars) mail list.
http://quest.arc.nasa.gov/mars/

Sky and Polarization

Date: Sun Oct  6 21:09:43 1996

Dear discuss-lfm members,

                         DO your experiments!

1. 90 deg scattering the blue sky is polarized. Look at the blue sky
through a polaroid. 

How to get polaroid: Electronic calculator (Liquid crystal equipments)
use polaroid. Take off!

2. Look at the rainbow through the polaroid. What a beautiful! Try it.

3. Half moon is scattering sunlight through 90 deg to you.
Is the half moon light polarized? 

4. What is Brewster's angle?

Thanks

Syu



Janet K.4cooks@msn.com showed me.


Re: Sky and Polarization
Date: Sun Oct  6 20:36:13 1996

Cheaper way to get a polarized lens--old fishing sunglasses.  We get 
them by the dozen for $7 a pair from K-Mart or WalMart.  They must be 
well-polarized because I can never read my watch!  jkcook


Thanks Janet!  (Reprinted be courtesy of Janet K. )