I did not know this. But How do I know at what point to take the glasses off? If I'm wrong and there's too much glare on the edge won't I burn my retina?
That is a very good question. And yes you don't want to risk it. In a simple sense it will become fairly dark and looking thru your solar glasses safety glasses you will see nothing. At that point totality begins. If you have timed out how long totality will be at your location that is when you start your timer. Personally I would give a good 10-15 seconds margin before I go looking. In 2017 I was using a telescope (and will do this eclipse) and then it gets to nothing in telescope with sun filter it is pretty clear it would be safe to look directly. I grant without the telescope there may be a point where some tiny amount of direct sunlight is still there that with sun safety glasses on you don't see anything. This giving it 10 to 15 seconds margin. There are phone apps to help time it as well as web sites to get the specific times it is safe. For me in 2017 I relied on my telescope with filter to know for sure when the last sliver of sun was covered. I knew I had about about three and a half minutes to set myself a timer for 3 min to be safe. As happened, I was viewing from a Walmart parking lot with lots of others and others had better timing than myself and some were giving countdowns to when glasses needed to be back on.
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Very cool thanks for sharing. Looking forward to it.
I feel like we should have had some Bonnie Tyler music on in the background LOL :)
I did not know this. But How do I know at what point to take the glasses off? If I'm wrong and there's too much glare on the edge won't I burn my retina?
That is a very good question. And yes you don't want to risk it. In a simple sense it will become fairly dark and looking thru your solar glasses safety glasses you will see nothing. At that point totality begins. If you have timed out how long totality will be at your location that is when you start your timer. Personally I would give a good 10-15 seconds margin before I go looking. In 2017 I was using a telescope (and will do this eclipse) and then it gets to nothing in telescope with sun filter it is pretty clear it would be safe to look directly. I grant without the telescope there may be a point where some tiny amount of direct sunlight is still there that with sun safety glasses on you don't see anything. This giving it 10 to 15 seconds margin. There are phone apps to help time it as well as web sites to get the specific times it is safe. For me in 2017 I relied on my telescope with filter to know for sure when the last sliver of sun was covered. I knew I had about about three and a half minutes to set myself a timer for 3 min to be safe. As happened, I was viewing from a Walmart parking lot with lots of others and others had better timing than myself and some were giving countdowns to when glasses needed to be back on.