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Oh wow, Williams College’s Hopkins Observatory has a huge collection of eclipse glasses & viewers (and other eclipse ephemera), some of them dating back to 1793. Here are a few of my favorites:
(via present & correct)
Cory Poole made this video of the annular solar ecplise yesterday using 700 photographs from a telescope with “a very narrow bandpass allowing you to see the chromosphere and not the much brighter photosphere below it.”
Cory says: “The filter only allows light that is created when hydrogen atoms go from the 2nd excited state to the 1st excited state.” Very cool.
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