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IIRC: An early (pre-telescope) astronomer did for tens of minutes at a time to document sun spots, but it took weeks for his sight to return and it was likely permanently damaged because of it.
Yep.
IIRC: An early (pre-telescope) astronomer did for tens of minutes at a time to document sun spots, but it took weeks for his sight to return and it was likely permanently damaged because of it.
Sheesh, and all he had to do was invent cameras to spare his eyes. For shame.
He only really needed to invent basic office supplies:
https://www.timeanddate.com/eclipse/box-pinhole-projector.html