ODD-RADIUS SUN HALOS
Many sky watchers have witnessed a halo around the sun--a single ring of light that surrounds the solar disk at a radius of 22 degrees. The phenomenon is caused by pencil-shaped ice crystals in cirrus clouds that bend sunlight. On April 26th, Harlan Thomas of Bowness, Alberta, witnessed rare concentric halos:
"I was working in the yard doing spring cleaning when I saw these most unusual halos around the sun," says Thomas. "I have really never seen multiple halos around the sun before. It was so funny. I was running around on the street looking for the right tree to block the sun, and people were asking what I was looking at. At first, they couldn't see it--then it was Wow what is that!?"