Is it safe to look naked-eye at the diamond necklace stage of an eclipse?
Q.My question is: during these brief seconds of "anularity" or whatever, during which the diamond necklace can be seen, is it safe to look at the sun directly? I know that for the rest of the event, looking directly naked-eye is a sure recipe for blindness. But during the "necklace" part of the show, can I look directly safely?
A.I've looked at the full noonday sun full on, eyes open, quite a number of times in my life and still don't need a guide dog. Then again, it was only for a few seconds, usually less than three before my eyes closed by reflex. For short periods it's not the sure-fire way to instant eye damage it has been hyped up to As lunar mountains protrude onto the hairline-thin ring of the Sun, it will be seen not as an unbroken ring but an irregular, changing, sparkling sequence of arcs, beads and diamonds very briefly encircling the Moon: a "diamond necklace" effect! This is a spectacle that viewers in the Panama and possibly Costa Rica might see."
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