Partial Solar Eclipse

Today we had a partial solar eclipse over much of US today. When I mentioned this to my son, Joe (4), he decided he wanted to know more about it.

I put together an eclipse viewer using a cardboard box, some aluminum foil and tape. It actually worked fairly well. We also noticed that you could see the eclipse projected on any flat surface when sunlight was being filtered by the leaves of a tree. I had heard of this effect before, but had never seen it in action. It was quite neat. You can see the effect in the second picture below. Click to view the large version of the photo.