I dont know who invented it but you should definitely use one if you want to see the eclipse. Looking directly at the sun can burn the back of your eyeball – so be careful! The pin hole camera lets you see the eclipse indirectly
Hugh’s got the ‘don’t look at the sun’ bit answered.
I was going to claim the Greeks invented it (they invented a lot of stuff), but it seems that the Chinese knew about pinhole cameras two and a half THOUSAND years ago!
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