The total solar eclipse will take place the morning of Aug. 21. Along with eclipse-viewing glasses, another simple and safe way to view the eclipse is with a box pinhole projector. It is easy to make from a cardboard box and ordinary household items.
This type of pinhole projector works on the same principle as a basic pinhole projector. However, the box makes this projector much sturdier and easier to set on a surface. And it only requires a few extra items to construct.
Long cardboard box
Pin or thumbtack
Sharp knife or paper cutter
Sheet of white paper
Cut a rectangular hole at the end of the box. You can tape two boxes together to make a long box. The longer the box, the larger the projected image.
Using the scissors, cut out a piece of the aluminum foil slightly larger than the rectangular hole. Make sure the foil is completely flat and not crinkled.
Tape the foil over the rectangular hole in the box.
Use the pin to poke a tiny hole in the center of the foil.
Tape the sheet of paper on the inside of the other end of the box.
Stand with your back toward the sun. Place the box over your head with the pinhole towards the sun. Adjust your position until you see a small projection, a negative image, of the eclipsed sun on the paper inside the box.
Never look at the sun directly without protective eye gear. Even sunglasses cannot protect your eyes from the damage the sun's rays can do to them.
Always keep your back toward the sun while looking at a pinhole projection.
Do not look at the sun through the pinhole.