For your viewing pleasure

http://www.cimms.ou.edu/~doswell/photopg/crepusc.JPG

http://www.cimms.ou.edu/~doswell/cha...uscular_98.JPG

http://jeffkirk.net/artwork/gallery/...cular_rays.jpg

http://www.whiteplanes.com/images/weather/weather16.jpg

Bonus:

Which is a classic backstay to the sun

Joe