Solar Eclipse 2026: A cereal box can be turned into a simple solar eclipse viewer using a few household items. This DIY pinhole projector allows you to observe the Sun indirectly by projecting its image onto a surface inside the box. It is an easy activity for children and families, but you should never look directly at the Sun through the pinhole or use the box as an optical viewer.
Solar Eclipse 2026: What Is A Cereal Box Eclipse Viewer?
A cereal box eclipse viewer is a homemade pinhole projector that creates a small image of the Sun inside a cereal box. Instead of viewing the eclipse directly, sunlight passes through a tiny hole and projects the Sun’s image onto white paper.
During a solar eclipse, the projected image can show the Moon gradually moving across the Sun.
Solar Eclipse 2026: How To Make A Cereal Box Eclipse Viewer?
Making a cereal box eclipse viewer is simple. Start with an empty cereal box and make sure it is firmly closed. Place a piece of white paper inside one end of the box to create a viewing screen.
Cover one of the openings at the opposite end with aluminium foil and secure it with tape. Carefully make a tiny pinhole in the centre of the foil using a pin or needle.
The hole should remain very small because it allows sunlight to enter and form a projected image on the white paper.
Solar Eclipse 2026: Materials Needed To Make A Cereal Box Viewer
You only need a few basic household items to make this DIY eclipse viewer:
- Empty cereal box
- Aluminium foil
- White paper
- Tape
- Scissors
- Pencil or pen
- Pin or needle
An adult should handle scissors and the pin or needle when children are taking part in the activity.
How To Use The Cereal Box Eclipse Viewer?
Take the completed viewer outdoors and stand with your back facing the Sun. Hold the cereal box so that the aluminium-foil-covered end faces the Sun.
Adjust the position of the box until sunlight passes through the pinhole and creates a small bright image on the white paper inside. You can then watch the projected image without looking directly at the Sun.
During an eclipse, the projected image will appear to change as the Moon moves in front of the Sun.
Safety Rules For Watching A Solar Eclipse
Never look directly at the Sun while making or using a cereal box eclipse viewer. Do not look through the pinhole toward the Sun. The viewer is designed for indirect projection only.
Do not use ordinary sunglasses as eclipse protection. Binoculars, cameras and telescopes should also never be pointed at the Sun without appropriate certified solar filters.
Children should use a pinhole projector under adult supervision. For direct solar viewing, use properly certified eclipse glasses or other approved solar-viewing equipment.
Why A Cereal Box Viewer Works
The cereal box viewer works on the principle of pinhole projection. Light from the Sun travels through the tiny opening in the aluminium foil and produces an image on the white paper inside the box.
Because the Sun is extremely far away, the pinhole can project its shape onto the paper. During a solar eclipse, the Moon blocks part of the sunlight, causing the projected image of the Sun to appear partially covered.
