What You Will See
How To View It Safely
Why Transits Happen

Use the duct tape to seal any holes that leak light past the cardboard.

Now point the binocular toward the sun while holding a piece of white cardboard about a foot behind the eyepiece. It will take a little effort to find the sun. Once you do, you can focus the binoculars to bring the sun to a sharp image.

Be careful not to put your hand or anything flammable near the eyepiece! The concentrated sunlight exiting there can cause a nasty burn or set something ablaze!

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