Solar Eclipse on May 31: Visible from Europe, Asia, Alaska, Northwest Canada

For more details on the eclipse, including viewing times for various cities, see the story at Astronomy.com or the full coverage at Space.com.

Unfortunately, unlike a lunar eclipse, you cannot look directly at a solar eclipse without risking permanent, irreversible damage to your eyes, which can make enjoying the event a lot more complicated. We’ve all learned how to make a pinhole camera to view a solar eclipse, but who wants to “project” the sun through a tiny card onto the ground or a piece of paper, and see a circle with a shadow cut out? It takes away from the experience because that is not how we normally think of the sun.

There are, fortunately, ways to view the eclipse more directly to make it more meaningful. The simplest is simply to get a welding helmet. If you are like me, you already have one in your garage, otherwise you can probably borrow one from a friend who lives on a farm or does auto body repair work. (Just be sure it has a passive filter and not an auto-darkening one, which may not darken during an eclipse.) With a welding helmet, which you can think of as a really good pair of sunglasses, you can look at the sun directly because, unlike sunglasses, they filter enough light at the right wavelengths. For additional safety tips and ideas, see this NASA web site on safe eclipse viewing.

As an important aside, if you have read physicist Richard P. Feynman’s autobiographies (and if you haven’t, you should), you probably remember that Feynman watched the atom bomb test in New Mexico in 1945 with his bare eyes, behind the windshield of a truck rather than wearing the protective goggles everyone else used. He explained that since glass filters out UV radiation, and “visible light can never hurt your eyes,” his eyes were safe. However, we now know a lot more about eye safety now than we did in 1945, and it unfortunately turns out that Feynman was wrong. Retinal burns, causing temporary or permanent damage, can occur from bright visible light, which regular glass does not filter. In Feynman’s case, it may have helped that he immediately and instinctively ducked for cover under the dashboard of the truck when the initial flash was so amazingly bright, but regardless he was lucky not to have suffered severe, permanent damage.