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Mercury transit 2016 in H-alpha light

Mercury’s Slow Glide Across the Sun

May 9th's transit of Mercury is now history. Countless amateurs — and professionals — watched as the innermost planet had its day in the Sun. It's sometimes the curse of being involved in astronomical outreach that I miss all the action during an important celestial event. For example, I never got to see Comet Shoemaker-Levy…