Pre-renaissance, medieval, roman, etc, did they know they shouldn’t look directly at the eclipse?
In: Planetary Science
Pinhole/camera obscura would have been the method for anyone who knew that. otherwise, looking at it for short periods of time would have been considered safe enough at the time.
You could also prepare a glass with a thin layer of lampblack to view through but glass was rare at one point as well.
People also would view it through the reflections in standing water etc. not perfect but safer. (do not recommend)
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