> > Of course you were :-) The only point you might want to expand on is that when the sun is nearest the horizon, the rays are traveling tangent to the viewer and, hence, through a larger distance of air. The further the sunlight has to travel through air molecules, the more likely the shorter-wave component of light (blue) is scattered out -- allowing only warmer red, orange, and yellow light to reach and delight the viewer's eyes.
>
> Now explain why the sky never appears green, even around the outer edge of a sunrise/sunset or just as it's appearing or disappearing.

It does, occasionally. In the tropics a 'green flash' is sometimes seen just as the sun dips below the horizon.

en"or so says Joseph Conrad"ile