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Pinhole Sun Viewer by Ronald Horii
The safest and cheapest way to view the sun and the solar eclipse is to make your own pinhole camera sun viewer. There are all kinds of information on the Internet on how to do this, like this from NASA, using a cereal box:
https://eclipse2017.nasa.gov/how-make-pinhole-projector-view-solar-eclipse
The problem is that those small pinhole viewers project a tiny image of the sun. To get a bigger image, you have to have more distance between the pinhole and projection surface. The problem with that is the farther you put the projection surface, the dimmer the image, until it becomes washed out by ambient light. The solution is to keep out the ambient light. Here's an example using a much bigger box that you can stick your head into: https://www.timeanddate.com/eclipse/box-pinhole-projector.html
I had a different idea that didn't requite such a big box. This is how I did it:
The safest and cheapest way to view the sun and the solar eclipse is to make your own pinhole camera sun viewer. There are all kinds of information on the Internet on how to do this, like this from NASA, using a cereal box:
https://eclipse2017.nasa.gov/how-make-pinhole-projector-view-solar-eclipse
The problem is that those small pinhole viewers project a tiny image of the sun. To get a bigger image, you have to have more distance between the pinhole and projection surface. The problem with that is the farther you put the projection surface, the dimmer the image, until it becomes washed out by ambient light. The solution is to keep out the ambient light. Here's an example using a much bigger box that you can stick your head into: https://www.timeanddate.com/eclipse/box-pinhole-projector.html
I had a different idea that didn't requite such a big box. This is how I did it:
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