Using a mirror:
Cover a small flat mirror with paper that has a small hole cut in it. The hole does not have to be circular but should be no wider than 5mm. A larger hole will produce a brighter but fuzzier image.
Prop up or clamp the mirror so that it reflects the sunlight onto a pale screen or wall, ideally through a window. A projection distance of five metres (16.4 feet) will produce an image of the Sun just over 5cm across.
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The eclipse can be seen in the image as the Moon starts to take a "bite" out of the Sun, appearing upside down compared with its position in the sky.
If clouds move across the face of the Sun, they can be seen as well.
The smaller the mirror and further away the wall, the sharper the image will be. Experiment with the distances and mirror size.
Do not look into the mirror during the eclipse as this is just as dangerous as looking directly at the Sun.
A big advantage of this method is that it allows a number of people to watch the eclipse at the same time - ideal for schools.