Sun symbols are perhaps the most common images in every culture.

http://www.windows.ucar.edu
The ever-useful "Windows to the Universe" site: mythical connections to the Sun, with three content levels (beginner, intermediate and advanced) for every link.

http://library.thinkquest.org/15215/
"The Sun: Man's Friend & Foe"

http://library.thinkquest.org/15215/sun_spot.html?tqskip1=1&tqtime=0602
"The Sun Spot" is part of "ThinkQuest". The first site is for teachers and older students. The second site is for students in grades 4-6.

http://observe.arc.nasa.gov/nasa/exhibits/sun/sun_4.html
NASA's Observatorium: What the Ancients Thought About the Sun