Introducing the Sun
Ask students what in space allows us to see. Should we look at it directly? If it damages our eyes (and cameras) to look at it directly, then how can we look at it. Use filters so most of the light does not reach the eye/camera. Share the background information with students, emphasising not to look at the Sun directly.
Making the Sun Viewer
Step 1
Take a cardboard box and cut a window at one of the short ends. Cut the window as wide as the box and about 3 cm high.

Step 2
Cut another window directly above the first. This window needs to be bigger than the previous one, cut it about 5 cm high. The smaller hole is going to be your viewing window. The bigger hole is going to be your projection window.

Step 3
Cut a piece of white cardboard to the same size as the bottom of the box.

Step 4
Insert the white cardboard into the opposite end.

Step 5
This is going to be your projection screen.

Step 6
Cut a piece of aluminium foil large enough to completely cover the projection window.

Step 7
Hold it up to the light to make sure that there are no holes in the foil.

Step 8
Tape the foil over the projection window.

Step 9
Hold your box up to an electric light and look through the viewing window to make sure that there are no pinpricks of light sneaking in.

Step 10
Seal any extra holes in the box.

Step 11
Take a pin, nail, or some other small, sharp object, and make a small hole in the foil. (You can experiment with the size of the hole, but about 3 mm works well.)

Observing With the Safe Sun Viewer
Step 12
Remember not to look at the Sun directly. Go outside and stand with your back to the Sun. Hold the box pointed at the ground so that the Sun’s light can pass through the pinhole in the foil and onto the screen.

Step 13
Look through the bottom window. The small circle of light that you will see is not just ‘light’ coming through the pinhole, it is an image of the Sun.

Warning: Don't look at the Sun directly without proper filtering.