Watching an eclipse
On Mon, 21 Aug 2017 20:16:09 +0100, Andy Burns
people were watching using special sunglasses. I though no sunglasses
were safe for looking directly at the sun?
special eclipse viewing filters aren't sunglasses.
Okay, but are they safe? I was taught as a child that NO device was
safe to look directly at the sun and the ONLY way to watch an eclipse
safely was via a pinhole projecting on to a sheet of paper.