Pre-renaissance, medieval, roman, etc, did they know they shouldn’t look directly at the eclipse?
In: Planetary Science
It’s pretty hard to look straight at an eclipse until it’s >95% covered. You can also see the crescent shape on the ground as the sunlight passes through leaves.
Quick glimpses won’t blind you but you can damage the retinas leaving a burned in image like when a flash bulb goes off. In time, that damage can resolve if not too bad.
Smoked glass was used by early astronomers to get views of the sun.
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