August 9, 2018: A partial solar eclipse happens when the Moon passes in front of the sun, off center, turning the solar disk into a fiery crescent. There are usually one or two partial solar eclipses somewhere on Earth every year. They look like this:
The first thing to remember about a partial eclipse is don’t stare at it. Even the tiniest sliver of sun left uncovered by the Moon can hurt your eyes. Instead, look at the ground. Beneath a leafy tree, you might be surprised to find hundreds of crescent-shaped sunbeams dappling the grass. Overlapping leaves create a natural array of pinhole cameras, each one casting an image of the crescent-sun onto the ground beneath the canopy.
No trees? Try this trick: Criss-cross your fingers waffle-style and let the sun shine through the matrix of holes. You can cast crescent suns on sidewalks, driveways, friends, cats and dogs—you name it. Hand shadows are fun, too, like the crescent-eyed turkey shown above.
Because partial eclipses typically last for more than an hour, there is plenty of time for shadow play and photography using safely-filtered telescopes and cameras.